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opencode/specs/09-session-page-hot-paths.md

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+## Session hot paths
+
+Reduce render work and duplication in `session.tsx`
+
+---
+
+### Summary
+
+`packages/app/src/pages/session.tsx` mixes routing, commands, tab rendering, review panel wiring, terminal focus logic, and message scrolling. This spec targets hot-path performance + local code quality improvements that can ship together in one session-page-focused PR. It should follow the keyed command-registration pattern introduced in `packages/app/src/context/command.tsx`.
+
+---
+
+### Goals
+
+- Render heavy file-tab content only for the active tab
+- Deduplicate review-panel wiring used in desktop and mobile paths
+- Centralize terminal-focus DOM logic into one helper
+- Reduce churn in command registration setup
+
+---
+
+### Non-goals
+
+- Scroll-spy rewrite (covered by `specs/04-scroll-spy-optimization.md`)
+- Large routing/layout redesign
+- Behavior changes to prompt submission or session history
+
+---
+
+### Parallel execution contract
+
+This spec owns:
+
+- `packages/app/src/pages/session.tsx`
+- New files under `packages/app/src/pages/session/*` (if extracted)
+
+This spec should not modify:
+
+- `packages/app/src/context/*`
+- `packages/app/src/components/prompt-input.tsx`
+- `packages/app/src/components/file-tree.tsx`
+
+---
+
+### Implementation plan
+
+1. Add shared helpers for repeated session-page actions
+
+- Extract `openReviewFile(path)` helper to replace repeated inline `onViewFile` bodies.
+- Extract `focusTerminalById(id)` helper and reuse in both:
+  - terminal active change effect
+  - terminal drag-end focus restoration
+
+2. Deduplicate review panel construction
+
+- Build a shared review props factory (or local render helper) so desktop/mobile paths do not duplicate comment wiring, `onViewFile`, and classes glue.
+- Keep per-surface differences limited to layout classes and diff style.
+
+3. Gate heavy file-tab rendering by active tab
+
+- Keep tab trigger list rendered for all opened tabs.
+- Render `Tabs.Content` body only for `activeTab()`, plus lightweight placeholders as needed.
+- Ensure per-tab scroll state restore still works when reactivating a tab.
+
+4. Reduce command registry reallocation
+
+- Register session commands with a stable key (`command.register("session", ...)`) so remounts replace prior session command entries.
+- Move large command-array construction into smaller memoized blocks:
+  - stable command definitions
+  - dynamic state fields (`disabled`, titles) as narrow computed closures
+  - Keep command IDs, keybinds, and behavior identical.
+
+---
+
+### Acceptance criteria
+
+- File tab bodies are not all mounted at once for large open-tab sets.
+- `onViewFile` review behavior is defined in one shared helper.
+- Terminal focus query/dispatch logic lives in one function and is reused.
+- Session command registration uses a stable key (`"session"`) and `command.register` no longer contains one monolithic inline array with repeated inline handlers for shared actions.
+- Session UX remains unchanged for:
+  - opening files from review
+  - drag-reordering terminal tabs
+  - keyboard command execution
+
+---
+
+### Validation plan
+
+- Manual:
+  - Open 12+ file tabs, switch quickly, verify active tab restore and no blank states.
+  - Open review panel (desktop and mobile), use "view file" from diffs, verify same behavior as before.
+  - Drag terminal tab, ensure terminal input focus is restored.
+  - Run key commands: `mod+p`, `mod+w`, `mod+shift+r`, `ctrl+``.
+- Perf sanity:
+  - Compare CPU usage while switching tabs with many opened files before/after.
+
+---
+
+### Risks and mitigations
+
+- Risk: unmounted tab content loses transient editor state.
+  - Mitigation: keep persisted scroll/selection restore path intact and verify reactivation behavior.
+- Risk: command refactor subtly changes command ordering.
+  - Mitigation: keep IDs and registration order stable, diff against current command list in dev.