## What and why
CodeNomad had no RTL (right-to-left) support, so users writing in Hebrew
or Arabic would see their messages displayed left-to-right — misaligned
text, broken reading flow, wrong punctuation placement.
This PR adds automatic direction detection to all elements that display
user or model text. The browser detects direction from the first strong
character in each text block: Hebrew/Arabic → RTL, Latin/code → LTR. No
configuration needed — it just works per message, per paragraph.
## Technical notes
The natural fix is `dir="auto"` on the containing elements. However,
Chromium does not propagate direction detection from a parent `<div>`
into its `<p>` children — so Hebrew inside `<p>` rendered via
`innerHTML` (as markdown is) was still detected as LTR. The fix is to
apply `unicode-bidi: plaintext` via CSS directly on the block-level
elements (`p`, `li`, headings, etc.), which has the same auto-detection
semantics but applies per element.
## Summary
- Add `dir="auto"` to all elements containing user-generated or
model-generated text (message content, prompt input, session names, tool
outputs) so the browser auto-detects text direction
- Add `unicode-bidi: plaintext` via CSS to markdown block elements (`p`,
`li`, headings, `blockquote`, `td`/`th`) to fix per-paragraph RTL
detection in Chromium (where `dir="auto"` on a parent div does not
recurse into block children)
- Convert physical CSS properties to logical equivalents in
`markdown.css`: `border-left` → `border-inline-start`, `padding-left` →
`padding-inline-start`, `text-align: left` → `text-align: start`,
`margin-left` → `margin-inline-start`
## Affected components
- `markdown.tsx` — main markdown renderer
- `message-part.tsx` — text part wrapper and plain-text fallback
- `message-item.tsx` — message body and error blocks
- `prompt-input.tsx` — user input textarea
- `session-list.tsx` — session titles in sidebar
- `session-rename-dialog.tsx` — session rename input
- `instance-welcome-view.tsx` — Resume Session dialog
- `tool-call/markdown-render.tsx` — tool output markdown fallback
- `tool-call/ansi-render.tsx` — ANSI output
- `tool-call/diagnostics-section.tsx` — diagnostic messages
## Test plan
- [ ] Send a Hebrew-only message → text right-aligned
- [ ] Send a mixed Hebrew + English message → correct per-paragraph
direction
- [ ] Message containing a code block → code stays LTR
- [ ] Type Hebrew in the prompt textarea → input flows right-to-left
- [ ] Hebrew session name in sidebar → right-aligned
- [ ] Hebrew session name in Resume Session dialog → right-aligned
🤖 Generated with [Claude Code](https://claude.com/claude-code)
---------
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
### Summary of Improvements
This PR replaces the custom `IntersectionObserver`-based virtualization
with the `virtua` library to significantly improve rendering performance
and UI responsiveness.
### 🚀 Performance Results
Verified using `session-performance.test.ts`:
- **Rendering**: 2000 messages rendered in **16.90ms**.
- **Huge Conversation**: 10,000 messages processed in **0.80ms**.
- **Session Switching**: Average switch time reduced to **0.58ms**
(virtually zero lag).
### 🛠️ Key Changes
- **Virtualized Message Stream**: Integrated `virtua/solid` for
efficient windowing and automatic scroll compensation.
- **Floating Scroll Controls**: Applied `position: absolute` and
`pointer-events: none` to the list controls to ensure
scroll-to-top/bottom buttons float correctly over the message area
without blocking interactions.
- **Package Synchronization**: Updated `virtua` and SDK dependencies,
with a fully synchronized `package-lock.json` for stable builds.
### 🎥 UI Verification
https://github.com/user-attachments/assets/24e483a3-8be6-4ac4-a431-d719f2015f4e
- **Smooth Scrolling**: Verified that rendering gaps are eliminated
during fast scrolls.
- **Position Retention**: Scroll positions are preserved when switching
between sessions.
> [!NOTE]
> Detailed performance gains and layout fixes are isolated to the
`virtua` implementation and core package updates, following the
requested cleanup.
---------
Co-authored-by: Shantur Rathore <i@shantur.com>
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.
Overhauls the message timeline sidebar with segment-level selection,
token-aware xray histogram bars, and messageId-based grouping — replacing
the previous message-level selection and positional adjacency logic.
## Selection System (SELECTION-SYSTEM)
- Dual-level selection: `selectedTimelineIds` (segment IDs) as the
source of truth, bridged to `selectedForDeletion` (message IDs) via
a reactive `createEffect`.
- CTRL+Click: toggles individual segments. Clicking an assistant parent
with unexpanded tools expands the group and selects all members.
Re-clicking collapses and deselects.
- SHIFT+Click: range selection. Direction follows anchor state — if the
anchor is selected the range is additive; if not, subtractive.
- Escape: clears all selection via a global keydown listener.
- Long-press (500ms, 10px jitter tolerance): mobile/touch selection
via pointer events with context-menu suppression.
- Scroll anchor preservation: captures badge offsetTop before toggling
visibility, restores scrollTop after layout shift.
## Token Count Fix (TOKEN-COUNT-FIX)
- New `getPartCharCount()` estimates characters for any `ClientPart`.
Handles text, tool state (input/output/metadata), and content arrays.
- **Skips `filediff` metadata key** — this key contains full before/after
file content that inflated character counts by 10-100x.
- `totalChars` field added to `TimelineSegment` and `PendingSegment`,
accumulated during `buildTimelineSegments()`.
## Scroll Performance (SCROLL-PERF)
- Two-tier positioning replaces per-badge `getBoundingClientRect` on
every scroll event:
1. `computeBadgeLayout()` — expensive pass, runs once on activation,
resize, or expansion. Stores `layoutTop` relative to scroll content.
2. `handleScrollRaf()` — RAF-throttled, reads 1 container rect per
frame. Derives all badge screen positions arithmetically.
- `clipBounds` subtracts delete toolbar height + 16px gap when toolbar
is visible, preventing xray bars from overlapping the toolbar.
## Group Logic (GROUP-LOGIC)
- `getAdjacentGroup()`: changed from backward positional walk to
`segments.filter(s => s.messageId === clicked.messageId)`. Fixes
cross-message group overlap when consecutive tool segments belong to
different assistant messages.
- `groupRole()`: checks for sibling tools via `messageId`.
- `isGroupStart()`: checks previous segment's `messageId`.
- Only assistant badges trigger group selection; tool and user badges
are always standalone.
## Active Highlight (ACTIVE-HIGHLIGHT)
- Renamed `activeMessageId` → `activeSegmentId` (signal, prop, and
comparison). Clicking a badge now highlights only that specific badge,
not all badges sharing the same messageId.
- Intersection observer resolves messageId → first segment's id.
- Auto-scroll effect uses segment id directly (no `.find()` lookup).
## XRay Histogram Bars (XRAY-BARS)
- Portal-based overlay with two bars per segment:
- Relative bar: width = tokens/maxTokens, green-to-red gradient.
- Absolute bar: width = tokens/10000 (capped), grey, with red glow
overflow indicator when tokens exceed ABSOLUTE_TOKEN_CAP (10K).
- Token labels as pill-shaped badges (white bg, dark border, 12px font,
1.5rem height matching badge height) at the left tip of each bar.
- `liveSegmentChars` memo fetches fresh char counts from the message
store to handle stale tool output that arrived after segment creation.
- `aggregateTokensByMessageId` memo: O(n) pre-computation replacing the
previous O(n²) per-segment iteration inside `<For>`.
- `clip-path: inset(...)` clips bars at layout edges.
## Delete Toolbar Token Display (TOKEN-TOTAL-IN-TOOLBAR)
- Removed `outputTokensByMessageId` (backend `entry.outputTokens` only
counted assistant output, missing tool result content entirely).
- `selectedTokenTotal` now sums `seg.totalChars` across all segments
for each selected messageId, divides by 4. Consistent with xray bars.
- Three color-coded pills: Before (muted, current context), Selection
(red, tokens being removed), After (green, remaining after deletion).
Eliminates mental arithmetic for users targeting a context token count.
## Delete Hover Fix
- Removed `selected.has(segment.messageId)` → `return true` from
`isDeleteHovered()`. The red delete overlay now only activates from
actual hover interactions (kind === "message" or "deleteUpTo"), not
from the selection state. This prevents the red overlay from masking
the blue segment-level selection highlight.
## CSS Changes
- message-selection.css: Restyled toolbar with accent-primary scheme,
three-pill token group, button variants (--delete, --cancel), hint.
- message-timeline.css: Selection styling (!important overrides), group
indicators (left border), xray overlay (fixed fullscreen, z-index 40),
rib/bar/label styles, container layout, stacking context isolation.
## Files Changed
- packages/ui/src/components/message-section.tsx (+345/-197)
- packages/ui/src/components/message-timeline.tsx (+671/-199)
- packages/ui/src/lib/i18n/messages/en/messaging.ts (+1/-2)
- packages/ui/src/styles/messaging/message-selection.css (+107/-34)
- packages/ui/src/styles/messaging/message-timeline.css (+146/-0)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Reverse the message stream scroll layout so the viewport naturally starts at the newest messages and keeps older content virtualized. Use sentinel-based edge chasing to make jump-to-top/bottom land reliably despite VirtualItem mounts.
Adds a dispose instance action to the instance info view, POSTing to /instance/dispose and rehydrating per-instance stores; also handles server.instance.disposed events and adds danger button styling.
Replace split/unified and context controls with icon toggles, add a word-wrap toggle (default on), and move the toolbar into the tab header to free vertical space.
Use OpenCode v2 file APIs for browsing and Monaco DiffEditor for session snapshot diffs, with local baseline language metadata and optional CDN language loading.
