Set the same explicit AppUserModelID that the legacy Electron app used so Windows taskbar grouping and notification attribution stay consistent in the Tauri desktop build.
Match the Tauri package, Cargo, and bundle version metadata to the current legacy desktop version so About dialogs and installer artifacts stop reporting 0.1.0.
Reconcile optimistic user messages by replacing the oldest synthetic pending message when the server-backed message arrives. Stop sending prompt part ids and rely on message-level replacement so v1.2.25 validation passes without duplicating optimistic content.
Disable follow-mode virtualization churn and simplify reasoning header layout so streaming thinking blocks stop nudging the scroll position while the list is pinned to bottom.
Keep visible rows mounted during follow-up measurements and clear stale refs so async message rendering no longer flickers or measures detached blocks. Coalesce per-item render notifications so content-heavy rows only trigger one remeasurement per frame.
Complete re-review of PR #188 (commits 224cab6 feature + 2c27fc5 perf/i18n follow-up). Gatekeeper focus: standards, correctness, perf/complexity, and translation completeness.
What this changes (pre -> post)
Pre: timeline primarily navigation/hover preview; bulk delete selection message-level and token metrics tied to backend assistant output tokens (missing tool payload weight).
Post: segment-level timeline selection + range (Shift) + toggle (Ctrl/Meta) + mobile long-press; histogram ribs overlay showing relative + absolute (~10k cap) token weight; assistant-turn grouping to avoid adjacency bugs; bulk-delete toolbar shows Before / Selection / After token pills.
Code standards / correctness
OK: Solid signal/memo/effect patterns with cleanup; no obvious lifecycle leaks. Grouping avoids adjacency overlap by mapping messageId to turns.
Fix: selection-id stability is mitigated by pruning stale ids after segment rebuilds; long term stable ids from part ids/toolPartIds remain recommended.
Fix: token counts now share getPartCharCount in both x-ray overlay and bulk-delete toolbar, keeping estimates consistent with live store updates.
Performance / complexity
OK: O(n^2) hotspots removed for liveSegmentChars and selectedTokenTotal. groupRole + deleteUpTo hover checks now memoize messageId sets/maps.
Note: getPartCharCount can be heavy for large tool payloads but remains gated behind selection mode.
CSS / UI integration
Fix: x-ray token label now uses theme tokens instead of hard-coded colors. Delete toolbar now uses menu-based controls with selection-mode toggle.
i18n
Fix: selection hint now renders Cmd/Ctrl via localized modifier placeholder; all locales updated.
Addresses bot review feedback on commit 224cab6.
## Performance: liveSegmentChars O(n²) → O(n)
The memo had three inner loops scanning all props.segments per unique
messageId. Added a single O(n) pre-pass building a
segmentsByMessageId Map, then replaced all three inner loops with
map lookups. Total complexity: O(n) instead of O(m×n).
File: packages/ui/src/components/message-timeline.tsx
## Performance: selectedTokenTotal O(n²) → O(n)
For each selected messageId, the memo scanned all segments to sum
chars. On "Select all" this was O(selected × segments). Now builds a
charsByMessageId map in one O(n) pass and does O(1) lookups per
selected message. Same pattern as aggregateTokensByMessageId.
File: packages/ui/src/components/message-section.tsx
## SSR guard: resize listener
window.addEventListener("resize", computeBadgeLayout) lacked a
typeof window !== "undefined" guard. Other window usage in the file
was guarded. Wrapped the addEventListener, requestAnimationFrame, and
onCleanup block in the guard.
File: packages/ui/src/components/message-timeline.tsx
## i18n: mirror selectionHint key in 5 locale files
messageSection.bulkDelete.selectionHint was only defined in
en/messaging.ts. Added the key (English string, since Ctrl/Shift/Esc
are universal keyboard labels) to es, fr, ja, ru, and zh-Hans.
Files: packages/ui/src/lib/i18n/messages/{es,fr,ja,ru,zh-Hans}/messaging.ts
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
