feat: Phase 7.1 — highlight prompt template + sequential citation [N] + highlightTerms parser

- Backend: add ==term== highlighting instruction to _SEED_GENERATE_PER_SUBQ
- Frontend: replaceFilename output with sequential [1] [2] [3] numbering
- Frontend: add highlightTerms() to convert ==term== to <mark> HTML
- Tests: 39 citation+highlight tests pass (28 updated + 11 new)
- Fix: QueryInput partialText styling and disabled state

backend/app/core/sqlite_db.py

@@ -48,6 +48,8 @@ _SEED_GENERATE_PER_SUBQ = (
     "Copy the exact bracket labels shown in the document chunks — "
     "do not modify filenames or add/remove extensions.\n"
     "Place the citation at the end of each bullet point.\n"
+    "For monetary figures (e.g., HK$1,000,000), percentages (e.g., 35%), key statistics, "
+    "and dates (e.g., 1 January 2024, 2023), wrap them in ==double equals markers== for highlighting.\n"
     "{context_sections}\n\n"
     "Answer:"
 )

frontend/package.json

@@ -33,6 +33,7 @@
     "jsdom": "^20.0.3",
     "ts-node": "^10.9.1",
     "typescript": "^5.1.6",
+    "vite": "^4.4.0",
     "vitest": "^0.34.3"
   },
   "pnpm": {

frontend/pnpm-lock.yaml

@@ -62,7 +62,7 @@ importers:
         version: 18.3.7(@types/react@18.3.28)
       '@vitejs/plugin-react':
         specifier: ^4.0.0
-        version: 4.7.0(vite@5.4.21(@types/node@25.7.0))
+        version: 4.7.0(vite@4.5.14(@types/node@25.7.0))
       jsdom:
         specifier: ^20.0.3
         version: 20.0.3
@@ -72,6 +72,9 @@ importers:
       typescript:
         specifier: ^5.1.6
         version: 5.9.3
+      vite:
+        specifier: ^4.4.0
+        version: 4.5.14(@types/node@25.7.0)
       vitest:
         specifier: ^0.34.3
         version: 0.34.6(jsdom@20.0.3)
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-
-  '@rollup/rollup-linux-riscv64-musl@4.60.3':
-    resolution: {integrity: sha512-Dhbyh7j9FybM3YaTgaHmVALwA8AkUwTPccyCQ79TG9AJUsMQqgN1DDEZNr4+QUfwiWvLDumW5vdwzoeUF+TNxQ==}
-    cpu: [riscv64]
-    os: [linux]
-    libc: [musl]
-
-  '@rollup/rollup-linux-s390x-gnu@4.60.3':
-    resolution: {integrity: sha512-cJd1X5XhHHlltkaypz1UcWLA8AcoIi1aWhsvaWDskD1oz2eKCypnqvTQ8ykMNI0RSmm7NkTdSqSSD7zM0xa6Ig==}
-    cpu: [s390x]
-    os: [linux]
-    libc: [glibc]
-
-  '@rollup/rollup-linux-x64-gnu@4.60.3':
-    resolution: {integrity: sha512-DAZDBHQfG2oQuhY7mc6I3/qB4LU2fQCjRvxbDwd/Jdvb9fypP4IJ4qmtu6lNjes6B531AI8cg1aKC2di97bUxA==}
-    cpu: [x64]
-    os: [linux]
-    libc: [glibc]
-
-  '@rollup/rollup-linux-x64-musl@4.60.3':
-    resolution: {integrity: sha512-cRxsE8c13mZOh3vP+wLDxpQBRrOHDIGOWyDL93Sy0Ga8y515fBcC2pjUfFwUe5T7tqvTvWbCpg1URM/AXdWIXA==}
-    cpu: [x64]
-    os: [linux]
-    libc: [musl]
-
-  '@rollup/rollup-openbsd-x64@4.60.3':
-    resolution: {integrity: sha512-QaWcIgRxqEdQdhJqW4DJctsH6HCmo5vHxY0krHSX4jMtOqfzC+dqDGuHM87bu4H8JBeibWx7jFz+h6/4C8wA5Q==}
-    cpu: [x64]
-    os: [openbsd]
-
-  '@rollup/rollup-openharmony-arm64@4.60.3':
-    resolution: {integrity: sha512-AaXwSvUi3QIPtroAUw1t5yHGIyqKEXwH54WUocFolZhpGDruJcs8c+xPNDRn4XiQsS7MEwnYsHW2l0MBLDMkWg==}
-    cpu: [arm64]
-    os: [openharmony]
-
-  '@rollup/rollup-win32-arm64-msvc@4.60.3':
-    resolution: {integrity: sha512-65LAKM/bAWDqKNEelHlcHvm2V+Vfb8C6INFxQXRHCvaVN1rJfwr4NvdP4FyzUaLqWfaCGaadf6UbTm8xJeYfEg==}
-    cpu: [arm64]
-    os: [win32]
-
-  '@rollup/rollup-win32-ia32-msvc@4.60.3':
-    resolution: {integrity: sha512-EEM2gyhBF5MFnI6vMKdX1LAosE627RGBzIoGMdLloPZkXrUN0Ckqgr2Qi8+J3zip/8NVVro3/FjB+tjhZUgUHA==}
-    cpu: [ia32]
-    os: [win32]
-
-  '@rollup/rollup-win32-x64-gnu@4.60.3':
-    resolution: {integrity: sha512-E5Eb5H/DpxaoXH++Qkv28RcUJboMopmdDUALBczvHMf7hNIxaDZqwY5lK12UK1BHacSmvupoEWGu+n993Z0y1A==}
-    cpu: [x64]
-    os: [win32]
-
-  '@rollup/rollup-win32-x64-msvc@4.60.3':
-    resolution: {integrity: sha512-hPt/bgL5cE+Qp+/TPHBqptcAgPzgj46mPcg/16zNUmbQk0j+mOEQV/+Lqu8QRtDV3Ek95Q6FeFITpuhl6OTsAA==}
-    cpu: [x64]
-    os: [win32]
-
   '@sinclair/typebox@0.27.10':
     resolution: {integrity: sha512-MTBk/3jGLNB2tVxv6uLlFh1iu64iYOQ2PbdOSK3NW8JZsmlaOh2q6sdtKowBhfw8QFLmYNzTW4/oK4uATIi6ZA==}
 
@@ -663,9 +522,6 @@ packages:
   '@types/estree-jsx@1.0.5':
     resolution: {integrity: sha512-52CcUVNFyfb1A2ALocQw/Dd1BQFNmSdkuC3BkZ6iqhdMfQz7JWOFRuJFloOzjk+6WijU56m9oKXFAXc7o3Towg==}
 
-  '@types/estree@1.0.8':
-    resolution: {integrity: sha512-dWHzHa2WqEXI/O1E9OjrocMTKJl2mSrEolh1Iomrv6U+JuNwaHXsXx9bLu5gG7BUWFIN0skIQJQ/L1rIex4X6w==}
-
   '@types/estree@1.0.9':
     resolution: {integrity: sha512-GhdPgy1el4/ImP05X05Uw4cw2/M93BCUmnEvWZNStlCzEKME4Fkk+YpoA5OiHNQmoS7Cafb8Xa3Pya8m1Qrzeg==}
 
@@ -1058,8 +914,8 @@ packages:
     resolution: {integrity: sha512-j6vWzfrGVfyXxge+O0x5sh6cvxAog0a/4Rdd2K36zCMV5eJ+/+tOAngRO8cODMNWbVRdVlmGZQL2YS3yR8bIUA==}
     engines: {node: '>= 0.4'}
 
-  esbuild@0.21.5:
-    resolution: {integrity: sha512-mg3OPMV4hXywwpoDxu3Qda5xCKQi+vCTZq8S9J/EpkhB2HzKXq4SNFZE3+NK93JYxc8VMSep+lOUSC/RVKaBqw==}
+  esbuild@0.18.20:
+    resolution: {integrity: sha512-ceqxoedUrcayh7Y7ZX6NdbbDzGROiyVBgC4PriJThBKSVPWnnFHZAkfI1lJT8QFkOwH4qOS2SJkS4wvpGl8BpA==}
     engines: {node: '>=12'}
     hasBin: true
 
@@ -1840,9 +1696,9 @@ packages:
     resolution: {integrity: sha512-g6QUff04oZpHs0eG5p83rFLhHeV00ug/Yf9nZM6fLeUrPguBTkTQOdpAWWspMh55TZfVQDPaN3NQJfbVRAxdIw==}
     engines: {iojs: '>=1.0.0', node: '>=0.10.0'}
 
-  rollup@4.60.3:
-    resolution: {integrity: sha512-pAQK9HalE84QSm4Po3EmWIZPd3FnjkShVkiMlz1iligWYkWQ7wHYd1PF/T7QZ5TVSD6uSTon5gBVMSM4JfBV+A==}
-    engines: {node: '>=18.0.0', npm: '>=8.0.0'}
+  rollup@3.30.0:
+    resolution: {integrity: sha512-kQvGasUgN+AlWGliFn2POSajRQEsULVYFGTvOZmK06d7vCD+YhZztt70kGk3qaeAXeWYL5eO7zx+rAubBc55eA==}
+    engines: {node: '>=14.18.0', npm: '>=8.0.0'}
     hasBin: true
 
   run-parallel@1.2.0:
@@ -2085,16 +1941,15 @@ packages:
     engines: {node: '>=v14.18.0'}
     hasBin: true
 
-  vite@5.4.21:
-    resolution: {integrity: sha512-o5a9xKjbtuhY6Bi5S3+HvbRERmouabWbyUcpXXUA1u+GNUKoROi9byOJ8M0nHbHYHkYICiMlqxkg1KkYmm25Sw==}
-    engines: {node: ^18.0.0 || >=20.0.0}
+  vite@4.5.14:
+    resolution: {integrity: sha512-+v57oAaoYNnO3hIu5Z/tJRZjq5aHM2zDve9YZ8HngVHbhk66RStobhb1sqPMIPEleV6cNKYK4eGrAbE9Ulbl2g==}
+    engines: {node: ^14.18.0 || >=16.0.0}
     hasBin: true
     peerDependencies:
-      '@types/node': ^18.0.0 || >=20.0.0
+      '@types/node': '>= 14'
       less: '*'
       lightningcss: ^1.21.0
       sass: '*'
-      sass-embedded: '*'
       stylus: '*'
       sugarss: '*'
       terser: ^5.4.0
@@ -2107,8 +1962,6 @@ packages:
         optional: true
       sass:
         optional: true
-      sass-embedded:
-        optional: true
       stylus:
         optional: true
       sugarss:
@@ -2345,73 +2198,70 @@ snapshots:
     dependencies:
       '@jridgewell/trace-mapping': 0.3.9
 
-  '@esbuild/aix-ppc64@0.21.5':
+  '@esbuild/android-arm64@0.18.20':
     optional: true
 
-  '@esbuild/android-arm64@0.21.5':
+  '@esbuild/android-arm@0.18.20':
     optional: true
 
-  '@esbuild/android-arm@0.21.5':
+  '@esbuild/android-x64@0.18.20':
     optional: true
 
-  '@esbuild/android-x64@0.21.5':
+  '@esbuild/darwin-arm64@0.18.20':
     optional: true
 
-  '@esbuild/darwin-arm64@0.21.5':
+  '@esbuild/darwin-x64@0.18.20':
     optional: true
 
-  '@esbuild/darwin-x64@0.21.5':
+  '@esbuild/freebsd-arm64@0.18.20':
     optional: true
 
-  '@esbuild/freebsd-arm64@0.21.5':
+  '@esbuild/freebsd-x64@0.18.20':
     optional: true
 
-  '@esbuild/freebsd-x64@0.21.5':
+  '@esbuild/linux-arm64@0.18.20':
     optional: true
 
-  '@esbuild/linux-arm64@0.21.5':
+  '@esbuild/linux-arm@0.18.20':
     optional: true
 
-  '@esbuild/linux-arm@0.21.5':
+  '@esbuild/linux-ia32@0.18.20':
     optional: true
 
-  '@esbuild/linux-ia32@0.21.5':
+  '@esbuild/linux-loong64@0.18.20':
     optional: true
 
-  '@esbuild/linux-loong64@0.21.5':
+  '@esbuild/linux-mips64el@0.18.20':
     optional: true
 
-  '@esbuild/linux-mips64el@0.21.5':
+  '@esbuild/linux-ppc64@0.18.20':
     optional: true
 
-  '@esbuild/linux-ppc64@0.21.5':
+  '@esbuild/linux-riscv64@0.18.20':
     optional: true
 
-  '@esbuild/linux-riscv64@0.21.5':
+  '@esbuild/linux-s390x@0.18.20':
     optional: true
 
-  '@esbuild/linux-s390x@0.21.5':
+  '@esbuild/linux-x64@0.18.20':
     optional: true
 
-  '@esbuild/linux-x64@0.21.5':
+  '@esbuild/netbsd-x64@0.18.20':
     optional: true
 
-  '@esbuild/netbsd-x64@0.21.5':
+  '@esbuild/openbsd-x64@0.18.20':
     optional: true
 
-  '@esbuild/openbsd-x64@0.21.5':
+  '@esbuild/sunos-x64@0.18.20':
     optional: true
 
-  '@esbuild/sunos-x64@0.21.5':
+  '@esbuild/win32-arm64@0.18.20':
     optional: true
 
-  '@esbuild/win32-arm64@0.21.5':
+  '@esbuild/win32-ia32@0.18.20':
     optional: true
 
-  '@esbuild/win32-ia32@0.21.5':
-    optional: true
-
-  '@esbuild/win32-x64@0.21.5':
+  '@esbuild/win32-x64@0.18.20':
     optional: true
 
   '@jest/diff-sequences@30.4.0': {}
@@ -2531,81 +2381,6 @@ snapshots:
 
   '@rolldown/pluginutils@1.0.0-beta.27': {}
 
-  '@rollup/rollup-android-arm-eabi@4.60.3':
-    optional: true
-
-  '@rollup/rollup-android-arm64@4.60.3':
-    optional: true
-
-  '@rollup/rollup-darwin-arm64@4.60.3':
-    optional: true
-
-  '@rollup/rollup-darwin-x64@4.60.3':
-    optional: true
-
-  '@rollup/rollup-freebsd-arm64@4.60.3':
-    optional: true
-
-  '@rollup/rollup-freebsd-x64@4.60.3':
-    optional: true
-
-  '@rollup/rollup-linux-arm-gnueabihf@4.60.3':
-    optional: true
-
-  '@rollup/rollup-linux-arm-musleabihf@4.60.3':
-    optional: true
-
-  '@rollup/rollup-linux-arm64-gnu@4.60.3':
-    optional: true
-
-  '@rollup/rollup-linux-arm64-musl@4.60.3':
-    optional: true
-
-  '@rollup/rollup-linux-loong64-gnu@4.60.3':
-    optional: true
-
-  '@rollup/rollup-linux-loong64-musl@4.60.3':
-    optional: true
-
-  '@rollup/rollup-linux-ppc64-gnu@4.60.3':
-    optional: true
-
-  '@rollup/rollup-linux-ppc64-musl@4.60.3':
-    optional: true
-
-  '@rollup/rollup-linux-riscv64-gnu@4.60.3':
-    optional: true
-
-  '@rollup/rollup-linux-riscv64-musl@4.60.3':
-    optional: true
-
-  '@rollup/rollup-linux-s390x-gnu@4.60.3':
-    optional: true
-
-  '@rollup/rollup-linux-x64-gnu@4.60.3':
-    optional: true
-
-  '@rollup/rollup-linux-x64-musl@4.60.3':
-    optional: true
-
-  '@rollup/rollup-openbsd-x64@4.60.3':
-    optional: true
-
-  '@rollup/rollup-openharmony-arm64@4.60.3':
-    optional: true
-
-  '@rollup/rollup-win32-arm64-msvc@4.60.3':
-    optional: true
-
-  '@rollup/rollup-win32-ia32-msvc@4.60.3':
-    optional: true
-
-  '@rollup/rollup-win32-x64-gnu@4.60.3':
-    optional: true
-
-  '@rollup/rollup-win32-x64-msvc@4.60.3':
-    optional: true
-
   '@sinclair/typebox@0.27.10': {}
 
   '@sinclair/typebox@0.34.49': {}
@@ -2697,8 +2472,6 @@ snapshots:
     dependencies:
       '@types/estree': 1.0.9
 
-  '@types/estree@1.0.8': {}
-
   '@types/estree@1.0.9': {}
 
   '@types/hast@3.0.4':
@@ -2759,7 +2532,7 @@ snapshots:
 
   '@ungap/structured-clone@1.3.1': {}
 
-  '@vitejs/plugin-react@4.7.0(vite@5.4.21(@types/node@25.7.0))':
+  '@vitejs/plugin-react@4.7.0(vite@4.5.14(@types/node@25.7.0))':
     dependencies:
       '@babel/core': 7.29.0
       '@babel/plugin-transform-react-jsx-self': 7.27.1(@babel/core@7.29.0)
@@ -2767,7 +2540,7 @@ snapshots:
       '@rolldown/pluginutils': 1.0.0-beta.27
       '@types/babel__core': 7.20.5
       react-refresh: 0.17.0
-      vite: 5.4.21(@types/node@25.7.0)
+      vite: 4.5.14(@types/node@25.7.0)
     transitivePeerDependencies:
       - supports-color
 
@@ -3114,31 +2887,30 @@ snapshots:
       has-tostringtag: 1.0.2
       hasown: 2.0.3
 
-  esbuild@0.21.5:
+  esbuild@0.18.20:
     optionalDependencies:
-      '@esbuild/aix-ppc64': 0.21.5
-      '@esbuild/android-arm': 0.21.5
-      '@esbuild/android-arm64': 0.21.5
-      '@esbuild/android-x64': 0.21.5
-      '@esbuild/darwin-arm64': 0.21.5
-      '@esbuild/darwin-x64': 0.21.5
-      '@esbuild/freebsd-arm64': 0.21.5
-      '@esbuild/freebsd-x64': 0.21.5
-      '@esbuild/linux-arm': 0.21.5
-      '@esbuild/linux-arm64': 0.21.5
-      '@esbuild/linux-ia32': 0.21.5
-      '@esbuild/linux-loong64': 0.21.5
-      '@esbuild/linux-mips64el': 0.21.5
-      '@esbuild/linux-ppc64': 0.21.5
-      '@esbuild/linux-riscv64': 0.21.5
-      '@esbuild/linux-s390x': 0.21.5
-      '@esbuild/linux-x64': 0.21.5
-      '@esbuild/netbsd-x64': 0.21.5
-      '@esbuild/openbsd-x64': 0.21.5
-      '@esbuild/sunos-x64': 0.21.5
-      '@esbuild/win32-arm64': 0.21.5
-      '@esbuild/win32-ia32': 0.21.5
-      '@esbuild/win32-x64': 0.21.5
+      '@esbuild/android-arm': 0.18.20
+      '@esbuild/android-arm64': 0.18.20
+      '@esbuild/android-x64': 0.18.20
+      '@esbuild/darwin-arm64': 0.18.20
+      '@esbuild/darwin-x64': 0.18.20
+      '@esbuild/freebsd-arm64': 0.18.20
+      '@esbuild/freebsd-x64': 0.18.20
+      '@esbuild/linux-arm': 0.18.20
+      '@esbuild/linux-arm64': 0.18.20
+      '@esbuild/linux-ia32': 0.18.20
+      '@esbuild/linux-loong64': 0.18.20
+      '@esbuild/linux-mips64el': 0.18.20
+      '@esbuild/linux-ppc64': 0.18.20
+      '@esbuild/linux-riscv64': 0.18.20
+      '@esbuild/linux-s390x': 0.18.20
+      '@esbuild/linux-x64': 0.18.20
+      '@esbuild/netbsd-x64': 0.18.20
+      '@esbuild/openbsd-x64': 0.18.20
+      '@esbuild/sunos-x64': 0.18.20
+      '@esbuild/win32-arm64': 0.18.20
+      '@esbuild/win32-ia32': 0.18.20
+      '@esbuild/win32-x64': 0.18.20
 
   escalade@3.2.0: {}
 
@@ -4078,35 +3850,8 @@ snapshots:
 
   reusify@1.1.0: {}
 
-  rollup@4.60.3:
-    dependencies:
-      '@types/estree': 1.0.8
+  rollup@3.30.0:
     optionalDependencies:
-      '@rollup/rollup-android-arm-eabi': 4.60.3
-      '@rollup/rollup-android-arm64': 4.60.3
-      '@rollup/rollup-darwin-arm64': 4.60.3
-      '@rollup/rollup-darwin-x64': 4.60.3
-      '@rollup/rollup-freebsd-arm64': 4.60.3
-      '@rollup/rollup-freebsd-x64': 4.60.3
-      '@rollup/rollup-linux-arm-gnueabihf': 4.60.3
-      '@rollup/rollup-linux-arm-musleabihf': 4.60.3
-      '@rollup/rollup-linux-arm64-gnu': 4.60.3
-      '@rollup/rollup-linux-arm64-musl': 4.60.3
-      '@rollup/rollup-linux-loong64-gnu': 4.60.3
-      '@rollup/rollup-linux-loong64-musl': 4.60.3
-      '@rollup/rollup-linux-ppc64-gnu': 4.60.3
-      '@rollup/rollup-linux-ppc64-musl': 4.60.3
-      '@rollup/rollup-linux-riscv64-gnu': 4.60.3
-      '@rollup/rollup-linux-riscv64-musl': 4.60.3
-      '@rollup/rollup-linux-s390x-gnu': 4.60.3
-      '@rollup/rollup-linux-x64-gnu': 4.60.3
-      '@rollup/rollup-linux-x64-musl': 4.60.3
-      '@rollup/rollup-openbsd-x64': 4.60.3
-      '@rollup/rollup-openharmony-arm64': 4.60.3
-      '@rollup/rollup-win32-arm64-msvc': 4.60.3
-      '@rollup/rollup-win32-ia32-msvc': 4.60.3
-      '@rollup/rollup-win32-x64-gnu': 4.60.3
-      '@rollup/rollup-win32-x64-msvc': 4.60.3
       fsevents: 2.3.3
 
   run-parallel@1.2.0:
@@ -4403,23 +4148,22 @@ snapshots:
       mlly: 1.8.2
       pathe: 1.1.2
       picocolors: 1.1.1
-      vite: 5.4.21(@types/node@25.7.0)
+      vite: 4.5.14(@types/node@25.7.0)
     transitivePeerDependencies:
       - '@types/node'
       - less
       - lightningcss
       - sass
-      - sass-embedded
       - stylus
       - sugarss
       - supports-color
       - terser
 
-  vite@5.4.21(@types/node@25.7.0):
+  vite@4.5.14(@types/node@25.7.0):
     dependencies:
-      esbuild: 0.21.5
+      esbuild: 0.18.20
       postcss: 8.5.14
-      rollup: 4.60.3
+      rollup: 3.30.0
     optionalDependencies:
       '@types/node': 25.7.0
       fsevents: 2.3.3
@@ -4447,7 +4191,7 @@ snapshots:
       strip-literal: 1.3.0
       tinybench: 2.9.0
       tinypool: 0.7.0
-      vite: 5.4.21(@types/node@25.7.0)
+      vite: 4.5.14(@types/node@25.7.0)
       vite-node: 0.34.6(@types/node@25.7.0)
       why-is-node-running: 2.3.0
     optionalDependencies:
@@ -4456,7 +4200,6 @@ snapshots:
       - less
       - lightningcss
       - sass
-      - sass-embedded
       - stylus
       - sugarss
       - supports-color

frontend/src/components/QueryInput.tsx

@@ -49,11 +49,11 @@ export const QueryInput: React.FC<QueryInputProps> = ({ onSubmit, onHalfQuestion
     }
   }
 
-  const isDisabled = isLoading || displayValue.trim() === ''
+  const isDisabled = isLoading || displayValue.trim() === '' || (!hasUserInput && !!partialText)
 
   const textareaClassName = [
     'w-full rounded border border-gray-300 px-3 py-2 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent disabled:bg-gray-100 disabled:cursor-not-allowed',
-    '',
+    showPartialStyle ? 'text-gray-400 italic' : '',
   ].filter(Boolean).join(' ')
 
   return (

frontend/src/test/components/ResponsePanel.test.tsx

@@ -197,7 +197,7 @@ describe('ResponsePanel', () => {
       />
     )
 
-    const citationLink = screen.getByRole('link', { name: /NEC4 ACC\.pdf, page 3/ })
+    const citationLink = screen.getByRole('link', { name: '1' })
     expect(citationLink).toBeInTheDocument()
     expect(citationLink).toHaveAttribute('target', '_blank')
     expect(citationLink).toHaveAttribute('href', expect.stringContaining('/pdf-viewer'))

frontend/src/test/utils/citationParser.test.ts

@@ -43,14 +43,14 @@ describe('processCitations', () => {
     const result = processCitations(text, mockSources)
     expect(result).toContain('](')
     expect(result).toContain('/pdf-viewer')
-    expect(result).toMatch(/\[NEC4 ACC\.pdf, page 3\]\([^)]+\)/)
+    expect(result).toMatch(/\[1\]\([^)]+\)/)
   })
 
   it('handles filename-only citation for DOCX (no page)', () => {
     const text = 'Notes [meeting_notes.docx] from meeting.'
     const result = processCitations(text, mockSources)
     expect(result).toContain('/pdf-viewer')
-    expect(result).toContain('meeting_notes.docx')
+    expect(result).toMatch(/\[1\]\([^)]+\)/)
   })
 
   it('leaves unmatched citations as plain text', () => {
@@ -64,26 +64,28 @@ describe('processCitations', () => {
     const result = processCitations(text, mockSources)
     const linkCount = (result.match(/\[.+?\]\(/g) || []).length
     expect(linkCount).toBe(2)
+    expect(result).toMatch(/\[1\]\([^)]+\)/)
+    expect(result).toMatch(/\[2\]\([^)]+\)/)
   })
 
   it('does not break existing markdown links', () => {
     const text = 'See [label](http://example.com) and [NEC4 ACC.pdf, page 3].'
     const result = processCitations(text, mockSources)
     expect(result).toContain('[label](http://example.com)')
-    expect(result).toContain('/pdf-viewer')
+    expect(result).toMatch(/\[1\]\([^)]+\)/)
   })
 
   it('does not break markdown images', () => {
     const text = '![diagram](http://example.com/img.png) and [NEC4 ACC.pdf, page 3].'
     const result = processCitations(text, mockSources)
     expect(result).toContain('![diagram]')
-    expect(result).toContain('/pdf-viewer')
+    expect(result).toMatch(/\[1\]\([^)]+\)/)
   })
 
   it('matches case-insensitively', () => {
     const text = 'Cite [nec4 acc.pdf, page 3] lowercase.'
     const result = processCitations(text, mockSources)
-    expect(result).toContain('/pdf-viewer')
+    expect(result).toMatch(/\[1\]\([^)]+\)/)
   })
 
   it('leaves plain bracket text without matching source', () => {
@@ -107,6 +109,7 @@ describe('processCitations', () => {
     const text = 'Source [no_path.pdf, page 1] with document link.'
     const result = processCitations(text, sourcesWithoutPath)
     expect(result).toContain('/rag-database?document=doc-fallback')
+    expect(result).toMatch(/\[1\]\([^)]+\)/)
   })
 
   it('remains plain text when both chunk_file_path and document_id are null', () => {
@@ -130,19 +133,19 @@ describe('processCitations', () => {
     const text = 'See [NEC4 ACC, page 3] without .pdf extension.'
     const result = processCitations(text, mockSources)
     expect(result).toContain('/pdf-viewer')
-    expect(result).toContain('NEC4 ACC, page 3')
+    expect(result).toMatch(/\[1\]\([^)]+\)/)
   })
 
   it('fuzzy matches citation with different case and without extension', () => {
     const text = 'Cite [nec4 acc] lowercase no extension.'
     const result = processCitations(text, mockSources)
-    expect(result).toContain('/pdf-viewer')
+    expect(result).toMatch(/\[1\]\([^)]+\)/)
   })
 
   it('fuzzy matches filename-only citation without extension', () => {
     const text = 'Notes [meeting_notes] from meeting (no .docx).'
     const result = processCitations(text, mockSources)
-    expect(result).toContain('/pdf-viewer')
+    expect(result).toMatch(/\[1\]\([^)]+\)/)
   })
 })
 

frontend/src/test/utils/highlightParser.test.ts

@@ -0,0 +1,73 @@
+import { describe, it, expect } from 'vitest'
+import { highlightTerms } from '../../utils/citationParser'
+
+describe('highlightTerms', () => {
+  it('converts single ==term== to mark element', () => {
+    const input = 'This is ==important== text.'
+    const result = highlightTerms(input)
+    expect(result).toBe('This is <mark class="bg-yellow-200 rounded px-0.5">important</mark> text.')
+  })
+
+  it('converts multiple ==term== markers in one string', () => {
+    const input = '==First== and ==second== highlight.'
+    const result = highlightTerms(input)
+    expect(result).toBe(
+      '<mark class="bg-yellow-200 rounded px-0.5">First</mark> and <mark class="bg-yellow-200 rounded px-0.5">second</mark> highlight.'
+    )
+  })
+
+  it('returns text unchanged when no markers present', () => {
+    const input = 'This text has no highlights.'
+    const result = highlightTerms(input)
+    expect(result).toBe(input)
+  })
+
+  it('returns empty string for empty input', () => {
+    const result = highlightTerms('')
+    expect(result).toBe('')
+  })
+
+  it('handles numeric values like ==HK$1,000,000==', () => {
+    const input = 'Amount: ==HK$1,000,000=='
+    const result = highlightTerms(input)
+    expect(result).toBe('Amount: <mark class="bg-yellow-200 rounded px-0.5">HK$1,000,000</mark>')
+  })
+
+  it('handles percentage values like ==35%==', () => {
+    const input = 'Rate: ==35%=='
+    const result = highlightTerms(input)
+    expect(result).toBe('Rate: <mark class="bg-yellow-200 rounded px-0.5">35%</mark>')
+  })
+
+  it('handles date values like ==1 January 2024==', () => {
+    const input = 'Date: ==1 January 2024=='
+    const result = highlightTerms(input)
+    expect(result).toBe('Date: <mark class="bg-yellow-200 rounded px-0.5">1 January 2024</mark>')
+  })
+
+  it('handles adjacent markers ==foo== ==bar==', () => {
+    const input = '==foo== ==bar=='
+    const result = highlightTerms(input)
+    expect(result).toBe(
+      '<mark class="bg-yellow-200 rounded px-0.5">foo</mark> <mark class="bg-yellow-200 rounded px-0.5">bar</mark>'
+    )
+  })
+
+  it('does not highlight markers inside backtick code spans', () => {
+    const input = 'Code: `==code==` and ==highlight=='
+    const result = highlightTerms(input)
+    expect(result).toBe('Code: `==code==` and <mark class="bg-yellow-200 rounded px-0.5">highlight</mark>')
+  })
+
+  it('does not highlight markers adjacent to backticks', () => {
+    const input = '`==not me==` ==but me== `==also not==`'
+    const result = highlightTerms(input)
+    expect(result).toBe('`==not me==` <mark class="bg-yellow-200 rounded px-0.5">but me</mark> `==also not==`')
+  })
+
+  it('passes through plain markdown text without markers unchanged', () => {
+    const input = '## Heading\n\n- Bullet one\n- **Bold text**\n\n[A link](http://example.com)'
+    const result = highlightTerms(input)
+    expect(result).toBe(input)
+  })
+})

frontend/src/utils/citationParser.ts

@@ -108,6 +108,7 @@ function replaceCitationPatterns(
   highlightKeys?: Set<string>
 ): string {
   const citationPattern = /(?<!!)\[([^\]]+)\](?!\()/g
+  let refCounter = 0
 
   return text.replace(citationPattern, (fullMatch, content: string) => {
     const trimmed = content.trim()
@@ -122,7 +123,8 @@ function replaceCitationPatterns(
       }
       const url = buildCitationUrl(source, isReady)
       if (url) {
-        return `[${trimmed}](${url})`
+        refCounter++
+        return `[${refCounter}](${url})`
       }
     }
 
@@ -160,3 +162,13 @@ export function extractCitedSources(answerText: string, sources: SourceMetadata[
 
   return result
 }
+
+export function highlightTerms(markdown: string): string {
+  const parts = markdown.split(/(`[^`]*`)/)
+  return parts
+    .map((part, index) => {
+      if (index % 2 === 1) return part
+      return part.replace(/(?<!`)==(.+?)==(?!`)/g, '<mark class="bg-yellow-200 rounded px-0.5">$1</mark>')
+    })
+    .join('')
+}