feat(desktop): add side conversation dock with multi-tab, quick prompts and i18n

[taekchef]

Description

Adds the side conversation dock: a lightweight parallel conversation panel that lets users ask follow-up questions without interrupting the main thread.

Core features

• Multi-tab side dock: a parent conversation can own multiple side tabs; closing a tab discards only that child conversation, while collapsing only hides the panel. Tabs are restored through GET /api/conversations/{id}/side.
• Backend fork modes: claude / opencode / vibe use agent_fork; codex, aionrs, and ACP backends without session/fork use text_snapshot; unsupported parent types do not show the side entry.
• Quick prompts: 26 short side-thinking prompts, rotating every 30 seconds, shown as 4 chips and prefilled into the side input without auto-sending.
• IPC and HTTP bridge: renderer/main bridge and HTTP bridge now cover side create/list lifecycle.
• Selection to side: selected main-thread text can be sent to "Ask in side" as composer prefill.
• /side command: opens the side dock from the main composer without recursively opening side conversations inside the side composer.
• Theme/i18n coverage: dark mode styles and all supported locales are covered.

Dependency

Depends on backend PR: iOfficeAI/AionCore#383

This frontend PR should be reviewed after #383, because the side dock needs:

• POST /api/conversations/{id}/side
• GET /api/conversations/{id}/side
• fork_mode in the create response

i18n

Updated all 9 supported locales from i18n-config.json:

zh-CN, en-US, ja-JP, zh-TW, ko-KR, tr-TR, ru-RU, uk-UA, pt-BR

New key range: conversation.sideConversation.*, including all quick prompt labels.

Testing

• bun run lint -- --quiet
• bun run format:check
• bunx tsc --noEmit
• bun run i18n:types
• node scripts/check-i18n.js
• bun run test - 1127 passed, 3 skipped
• bun run test:coverage - 1127 passed, 3 skipped
• AIONUI_BACKEND_BIN=/private/tmp/AionCore-pr383/target/debug/aioncore AIONUI_DATA_DIR=/private/tmp/aionui-policy-db.kdsq8G VERIFY_PORT=25999 node scripts/verify-side-fork-policy.mjs

Coverage highlights for the new side-conversation logic:

File	Line coverage	Branch coverage	Function coverage
buildCreateSideConversationParams.ts	100.0%	68.2%	100.0%
resolveParentForkMsgId.ts	100.0%	66.7%	100.0%
sideConversation.ts	100.0%	100.0%	100.0%
sideConversationState.ts	100.0%	50.0%	100.0%
useSideConversation.ts	93.2%	69.5%	92.7%
ChatConversation.tsx	53.3%	60.6%	35.5%
SelectionReplyButton.tsx	78.3%	45.9%	84.6%
SideConversationDock.tsx	88.9%	100.0%	75.0%
SideConversationHeader.tsx	100.0%	100.0%	100.0%
SideConversationTabBar.tsx	100.0%	100.0%	100.0%
SideQuickPrompts.tsx	100.0%	-	100.0%
renderPlatformChat.tsx	100.0%	92.3%	100.0%
Local diff+lcov patch estimate	78.22%	-	-

Side-fork policy verification:

• codex -> text_snapshot
• aionrs -> text_snapshot
• claude -> agent_fork
• openclaw skipped locally because the copied dev DB had no OpenClaw parent conversation

Screenshots

Main thread + side dock

Side dock detail

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 89ba75ece8

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[chatgpt-codex-connector]

Avoid creating a new tab when reopening the side dock

When a parent already has side tabs, the main composer side button/shortcut and bare /side command call this onOpenSide path with no question, but this branch always calls openNewTab(). In the collapsed/hidden-panel case this creates an extra empty side conversation and issues another POST /side instead of simply showing the existing active tab; side.open() already focuses existing tabs and only creates when none exist.

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[sentry]

Codecov Report

❌ Patch coverage is 62.31579% with 179 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...nents/SideConversationPanel/useSideConversation.ts	78.57%	14 Missing and 31 partials ⚠️
...top/src/renderer/components/chat/SendBox/index.tsx	2.56%	38 Missing ⚠️
...pages/conversation/components/ChatConversation.tsx	44.00%	23 Missing and 5 partials ⚠️
...pages/conversation/components/ChatLayout/index.tsx	0.00%	19 Missing ⚠️
...c/common/chat/buildCreateSideConversationParams.ts	55.55%	0 Missing and 12 partials ⚠️
...nversation/platforms/aionrs/AionrsPlatformChat.tsx	0.00%	10 Missing ⚠️
...es/conversation/platforms/aionrs/AionrsSendBox.tsx	0.00%	6 Missing ⚠️
...ation/Messages/components/SelectionReplyButton.tsx	78.94%	0 Missing and 4 partials ⚠️
...erer/pages/conversation/components/ChatHistory.tsx	0.00%	3 Missing ⚠️
...er/pages/conversation/platforms/acp/AcpSendBox.tsx	40.00%	0 Missing and 3 partials ⚠️
... and 8 more

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