Align fullscreen return button with project actions

.project-docs/30-worklog/tasks/20260929-code-back-entry-33d87a81.md

@@ -8,7 +8,7 @@
 - Worktree: /Users/chillishark/Makelore 麦洛/.codex-worktrees/makelore/20260929-empty-work-merge-39c633d0
 - Base commit: a77ddbd6813bb71d490544edfef6e1f35240070f
 - Owner: codex
-- Status: Ready for Integration
+- Status: Planning
 
 ## Scope
 
@@ -139,3 +139,13 @@
 - Temporary app updated in place from the current composite, preserving all 13 prior overlays and adding 883ae1d. Final source: `sidebar-rails-33d87a81/source`; live/next JS `index-pmc1zOQa.js`, common CSS `index-D1Sa4hBY.css`, route CSS `index-CEKmXNFU.css`. Launch/guidance/build metadata finalized consistently. Main PID 32583/profile/native visibility and focus are unchanged; no formal installation or main/remote update.
 - Live checks confirm return and collapse centers align with the project/conversation header, the 46px brand aligns with the 46px tab row, native traffic lights and breadcrumb hit areas remain clear, and Works Square/New Project have matching height, border, radius, padding, typography and shadow, with the requested pale fill and equal 10px gaps. An unfocused-window color transition was paused at time zero; completed that button's six pending visual transitions before comparing final computed styles. No navigation or data action was triggered by this check.
 - Account, current conversation/messages, all 14 consultation drafts, closed teacher panel/content and Operation Chat selection match the pre-refresh snapshot; all 34 recorded data hashes unchanged, zero alerts. Released refresh lease, restored background throttling and closed the task-opened inspector. Temporary app ready; working branch retains the source for later integration.
+
+
+## Follow-up: Left-Align Return In Native Fullscreen
+
+- User asks to align the return button's left edge with New Project. Live read-only inspection confirms the current macOS trial is in native fullscreen, while DOM fullscreen and display-mode media queries are both false; the existing 88px native-traffic-light reservation is unnecessary in that state. Keep current vertical alignment and collapse placement; fullscreen and Windows return inset is 12px, while macOS windowed mode retains the native safe inset.
+- Project Context Loaded / Planning Gate: Passed. Exact same-task feature identity and official resume verified. Active task, entry and all peer scopes reread; previously loaded memory/architecture/domain/context unchanged from 80b0cb9, no new peer scope conflict. Current trial source sidebar-rails-33d87a81/source is consistent with served and has all 14 overlays. Preserve native window behavior and Main ownership: add only a read-only fullscreen query/event bridge, subscribe before querying with race protection, then adapt the existing titlebar. No screen-size heuristic or native-button hiding.
+- Plan: small reusable Main fullscreen IPC binding plus Preload allowlists, renderer subscription adapter and conditional 12px titlebar padding, update focused fullscreen/reopened-window/race tests and existing E2E with simulated native events in the isolated test process. For the existing trial, install only this read-only Main binding and allowlist addition alongside the new Renderer, preserve the current Main/profile/window state, and record the startup overlay for next launch. No main merge/push or formal-app change.
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+- Implemented native fullscreen query/event binding with window-reopen support, scoped preload allowlists, a race-safe Renderer observer and 12px fullscreen/Windows return inset. macOS windowed traffic-light space, rail widths, collapse coordinates and brand position are unchanged. The observer also keeps the safe inset when an older preload rejects the event. 27 focused unit tests, typecheck, scoped lint and production build passed; the existing Electron navigation E2E passed including enter/leave native events, exact return/New Project left alignment and unchanged brand/collapse boxes. Fullscreen screenshot inspected. Final candidate includes the fallback fix and passes typecheck/lint/build.
+- Temporary composite preserves all previous overlays and differs in exactly five product files. Its older Main adapter retains single-window semantics; the live update will install only the standalone read-only fullscreen module and two preload allowlist additions, not replace the Main bundle. Publication pending.