Implement expandable volume breakdown with page chips in search panel

Implement synonym and related words highlighting in search results and reader panel

fix: resolve pythainlp and huggingface_hub Permission Denied errors by setting HOME and HF_HOME env variables, and add 'Try searching with AI' button to empty search state

fix: extract and highlight individual matched words from snippets in both AI and FTS modes

fix: highlight matching keywords when jumping from volume breakdown bars

fix: highlight not showing - set highlightQuery after setVolume not before

feat: highlight search keywords on reader page with auto-scroll to first match

feat: FTS5-first + AI button search with split button mode selector

feat: update technology badge in NavDrawer overview tab to Turbovec + Reranker

feat: add Google-style breadcrumb navigation to search results

fix: change search result card div to button to fix touch/click event bubbling on iOS Safari

ux: optimize mobile search result tap responsiveness and drawer closing animation smoothness

feat: refine 84000.org attribution and add explicit disclaimer

feat: add 84000.org source attribution to overview tab

Update architecture metadata: Switch to Qdrant + Reranker in Overview UI and AI Store state

Fix TS type error: searchRef HTMLDivElement -> HTMLFormElement

Expand POPULAR_TERMS: 40 -> 293 via 84000.org dictionary

Deploy React+FastAPI webapp to HF Space