Make older chat conversations reachable through existing pagination

[Maya-Kid]

Post-merge synchronization (2026-09-22)

Rebased onto dev@7cfeedfeb11c3a1c42d5091c5941a51afaaeb161 after #848, #851, #849, #850 and #852 merged. Current head: a6737587017c740a172dd2fba21bf9d55ab5d497.

The UI dependency order remains #854 → #856 → #855. Retained upstream stream-interruption strings alongside the history/pagination keys when resolving i18n conflicts. The complete UI tree is byte-for-byte identical to the previous validated integration tree. Maintainer visual review remains outstanding.

Validation on combined tree d06f4ad0199a382635a6bbf94210b9421cbeba66 (675 tracked Linux inputs hash-matched):

• Rust fmt, strict workspace/all-target Clippy and workspace build passed. Workspace tests: 1018 passed, 0 failed, 5 ignored. The two delivery/process-kill parent tests and busy-deferral test additionally passed on their own exclusive database; crash_child is invoked by its parent. The existing public-network RSS test remains ignored.
• The exact unified Chat CI command listed and executed 47 passing tests, including all 37 introduced tests from Hand off exhausted tool runs to an evidence-only final answer #845/Keep older chat handles from unregistering newer generations #848/Publish citation sources added by document reads #849/Keep fallback retrieval failures distinct from empty results #850/Preserve exact chat outcomes across stream closure and reattachment #851/Do not report fallback chat completion when saving fails #852/Assert a chat turn ends in exactly one earned terminal #858. All four terminal-table rows ran. Seven deliberately omitted groups each produced a green Cargo result but were rejected by the independent executed-test checker (exit 1); the complete run passed (exit 0).
• Frontend: 129 module tests, 27 browser subtests (29 including parent tests) and build/typecheck/guard passed.
• The five actual-backend browser scenarios from the previous validation were not repeated this time: the complete frontend and frozen finalization/LLM implementation are unchanged. This pass reruns the deterministic browser and real-PostgreSQL Rust regressions. No new paid-model accuracy claim is made.

Earlier evidence below refers to its stated historical heads.

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The conversation rail only requests the first 30 records even though the existing list endpoint already provides limit, offset and total. Older conversations remain available by URL or search, but cannot be reached by browsing the rail.

Use the existing infinite-query support to load bounded 30-record pages, scoped by knowledge base and search term. Keep loaded rows on next-page failure and retry the same offset. Deduplicate by conversation ID, and let list invalidation refetch the loaded page range when updated conversations change the ordering. No API, database schema or dependency changes are introduced.

Validation on dev@ea0557b, fix 9ed91f7:

• The 65-conversation browser regression fails on the original Chat component because there is no way to request the next page.
• All 11 real-component browser subtests pass: 65 records; 0/30/31/60 boundaries; failure/retry; stale pages after search or KB changes; duplicate IDs with identical titles; multi-page search; and refetching loaded pages after reordering. These tests use controlled HTTP responses with the real router/query client/Chat component.
• Frontend 116 module tests and build/typecheck/guard pass.
• Chrome against the actual Linux server and PostgreSQL browsed 65 synthetic persisted conversations through the real list API and reached all 65.
• Separately, integration tree f7bcd0878bf490d6efb122b71d6f13d379df4709 with Hand off exhausted tool runs to an evidence-only final answer #845 and the other scoped Chat fixes passes Rust fmt, strict workspace Clippy, 1,013 tests (one pre-existing external-HTTPS RSS test ignored), workspace build, 129 frontend module tests, 27 browser subtests and frontend build.

The browser test uses optional Playwright/Chromium, matching the existing browser-test pattern. Run node --test tests/chat-pagination.test.mjs from web; CHAT_PLAYWRIGHT_PATH and CHAT_CHROMIUM_PATH may specify local installations.

Offset pagination still does not provide a snapshot across concurrent updates. Deduplication prevents repeated rows; a later invalidation refreshes the loaded range. This patch does not claim stable traversal under arbitrary concurrent writes.

[WaylandYang]

Merge-order note for the three Chat view PRs, from trial merges onto 79caca04:

OK        #854
CONFLICT  #855   web/src/pages/Chat.tsx  web/src/i18n/en.ts  web/src/i18n/zh.ts
OK        #856   (clean on top of #854, as its stated dependency implies)

So the order is #854, then #856, then this one, and this is the one that needs the rebase. Nothing surprising — all three edit Chat.tsx and add adjacent i18n keys.

Two notes while I am here:

• web/tests/ is an existing location (rss-default.test.mjs is already on dev), so the .test.mjs files land where they belong. No concern there.
• These three change what a person sees, so per the convention in this repository they wait for a maintainer to look at the running interface before merging, separately from CI being green. I have flagged them for that.

[Maya-Kid]

Completed the requested branch alignment: #854 → #856 → #855. Pagination is now replayed on #856 at d01cc796b9ad2e3911fd56cb8133763c2b121b8c, with the import/i18n conflicts resolved. All three contain current dev 474b904; the PR description now states the stacked dependency explicitly.

The stack passes 116 frontend module tests, 27 browser subtests and build/typecheck/guard. The combined tree also passes the actual Linux/PostgreSQL 65-conversation pagination scenario and the other four backend/browser scenarios. This does not replace your requested visual review. Full verification and historical evidence are in the updated descriptions.

[Maya-Kid]

Completed the post-merge synchronization of the remaining UI stack onto dev@7cfeedf, preserving the requested #854 → #856 → #855 order. Current heads: #854 bd11c1d9ea61f5015d55ed8bc0f656c1bb2e2717, #856 ba964f3aaa94ae514f9e585c04329f642708299d, #855 a6737587017c740a172dd2fba21bf9d55ab5d497. The i18n conflict resolution retains the merged stream-interruption strings together with the history/pagination strings.

The complete UI tree is identical to the previously validated integration tree. Revalidation passes 129 frontend module tests, 27 browser subtests (29 including parent tests), typecheck/guard/build. Updated all three descriptions; maintainer visual review remains separate and outstanding.