feat(chat): add task progress indicator and stabilize ingress replay

[AlphaCatMeow]

Summary

• stop reliable chat ingress from repeating compacted replay requests indefinitely by escalating repeated gaps to checkpoint recovery for both batches and fragments
• project the latest valid full TodoWrite snapshot from the current conversation transcript/history, preferring successful tool results and using stable complete arguments as a fallback
• add the same accessible task-progress pill above the desktop GUI and Gateway WebUI composers, with hover/focus expansion, delayed close, Escape/touch handling, narrow-window support, reduced motion, and long-list scrolling
• keep the plan roster stable while task statuses advance, ignore partial/invalid/failed frames, clear on a valid empty list, and hide the previous indicator immediately when the user submits the next turn
• remove TodoWrite progress rendering from the transcript while retaining its transcript/history data for projection; preserve all unrelated tool bubbles
• add mirrored projection, sequencing, interaction, adapter, i18n, transcript-filtering, and manifest coverage

Rebase and diff audit

• rebased the complete two-commit PR from original merge base 849daf269762846557cc8243c5fe6e7fb155ed72 onto latest upstream/main@00a2c6fc43754f40022b0703459824559bee73ea
• updated head from 7fb096839d5fd423a981f384227bdd3a08876515 to c63a2c22e7215650925156ace8f795b2634d6406; the branch is 0 behind / 2 ahead and its merge base is the latest main commit
• retained the closed-unmerged PR fix(gateway): recover compacted chat ingress gaps #343 ingress recovery commit as the first commit, followed by the task-progress feature commit; feat(chat): add task progress indicator and stabilize ingress replay #345 is now the independent replacement root rather than declaring a stale active dependency
• git range-diff reports the ingress commit as patch-equivalent; the feature commit retains the same product patch and differs only by the refreshed docs/worklog/task-progress-indicator.md rebase/acceptance record
• original and rebased ranges contain the same 28-file product scope; final stats are 4055 insertions / 61 deletions
• audited the six PR files also changed by newer main commits (GatewayApp.tsx, both i18n configs, GUI ChatComposerBar.tsx, GUI ChatPage.tsx, and mirror-manifest.json); latest-main behavior is retained together with the original PR patch
• no rebase conflicts, PR-to-PR ancestry, dependency/lockfile changes, Rust changes, database changes, generated binaries, credentials, or unrelated lifecycle changes

Validation

• go -C crates/agent-gateway test ./internal/session ./test/websocket — passed
• focused GUI task-progress, sequencing, indicator, and row-model suites — 40/40 passed
• focused Gateway WebUI task-progress, sequencing, indicator, and assistant-bubble suites — 23/23 passed
• pnpm --dir crates/agent-gateway/web test — 515/515 passed
• pnpm --dir crates/agent-gui test:frontend — 1422/1427 passed; the same five mention source-extraction and Rust/TypeScript preset-sync failures reproduce on a fresh non-Worktree upstream/main@00a2c6fc snapshot at 1398/1403
• go -C crates/agent-gateway test ./... — every package passed except the Windows-only internal/auth/agenttoken file-mode assertion (0666, expected POSIX 0600); the same package fails identically on the latest-main snapshot
• go -C crates/agent-gateway vet ./... — passed
• pnpm --dir crates/agent-gui build — passed
• pnpm --dir crates/agent-gateway/web build — passed
• cargo check --manifest-path crates/agent-gui/src-tauri/Cargo.toml --tests — passed after resolving LIBCLANG_PATH through the existing local Python clang runtime; five unrelated unused/dead-code warnings remain
• full GUI Biome: current 423 errors / 358 warnings / 9 infos versus recorded same-main baseline 424 / 358 / 9; full WebUI Biome: current and baseline both 292 / 310 / 10
• focused production-file Biome lint — exited zero for both clients; warnings are confined to existing adapter/hook code
• node scripts/check-mirror.mjs — passed for 118 mirrored files
• git diff --check upstream/main..HEAD — passed
• independent final read-only audit — 28-file product scope preserved, accepted product tree unchanged by the documentation-only final amend, protected local files excluded, and no P0/P1/P2 findings
• GitHub new-head checks for c63a2c22: PR Governance (two runs), Gateway, Gateway Docker Smoke, Gateway WebUI, GUI, Tauri Rust Check, GUI/WebUI Mirror Check, and Diff Hygiene all completed successfully

Manual acceptance

• launched the Windows Tauri client from the current main workspace and rebased product HEAD 8a0663e4a1a9126bcf1d79a20b148a3d9336aa05; Vite returned HTTP 200 and the worktree-local target/debug/liveagent.exe window remained responsive
• verified a 12-item TodoWrite plan appears once without partial-count flicker, keeps stable row titles/order/count, advances statuses in place, hides TodoWrite transcript cards, and preserves unrelated tool bubbles
• verified hover, focus, Escape, click/touch toggle, delayed close, narrow-window wrapping/internal scrolling, light/dark themes, reduced motion, and accessible state behavior
• verified the next user turn hides the previous progress indicator without stale revival
• verified Stop followed by continue preserves and resumes the same roster without duplicate rows or regressions
• verified conversation switching, history restoration, reload/reconnect, repeated snapshots, and live/history overlap restore the latest valid state without replay or duplication
• invalid/partial frames, duplicate/overflow handling, checkpoint validation, ingress gap replay/escalation, provisional fallback, ARIA, and reduced-motion branches are additionally covered by automated tests
• the final commit c63a2c22e7215650925156ace8f795b2634d6406 differs from the accepted product HEAD only in this worklog documentation; a path-by-path comparison found zero product-code changes
• the user explicitly confirmed PR #345 通过 on 2026-08-06 before the guarded force-with-lease update

Screenshot

Scope

• Gateway changes are limited to reliable chat-ingress replay/checkpoint recovery and matching tests
• GUI and Gateway WebUI task-progress changes remain mirrored
• no Rust, database, dependency, credential, or unrelated module changes
• no cross-session task center or file-change statistics

Fixes #344
Fixes #346
Depends-On: none
Stack-Root: #345

[github-actions]

PR governance checks passed. Awaiting human review.