Improve startup dictionary progress and fix overlay/plugin input handlin

- show a dedicated startup OSD "building" phase for character dictionary sync
- forward bare `Tab` from visible overlay to mpv so AniSkip works while focused
- fix Windows plugin env override resolution for `SUBMINER_BINARY_PATH`

backlog/tasks/task-145 - Show-character-dictionary-build-progress-on-startup-OSD-before-import.md

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+---
+id: TASK-145
+title: Show character dictionary build progress on startup OSD before import
+status: Done
+assignee: []
+created_date: '2026-03-09 11:20'
+updated_date: '2026-03-09 11:20'
+labels:
+  - startup
+  - dictionary
+  - ux
+dependencies: []
+references:
+  - /home/sudacode/projects/japanese/SubMiner/src/main/runtime/character-dictionary-auto-sync.ts
+  - /home/sudacode/projects/japanese/SubMiner/src/main/runtime/startup-osd-sequencer.ts
+  - /home/sudacode/projects/japanese/SubMiner/src/main/runtime/character-dictionary-auto-sync.test.ts
+priority: medium
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+
+Surface an explicit character-dictionary build phase on startup OSD so there is visible progress between subtitle annotation loading and the later import/upload step when merged dictionary generation is still running.
+
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+
+<!-- AC:BEGIN -->
+
+- [x] #1 Auto-sync emits a dedicated in-flight status while merged dictionary generation is running.
+- [x] #2 Startup OSD sequencing treats that build phase as progress and can surface it after annotation loading clears.
+- [x] #3 Regression coverage verifies the build phase is emitted before import begins.
+<!-- AC:END -->
+
+## Implementation Notes
+
+<!-- SECTION:NOTES:BEGIN -->
+
+Added a `building` progress phase before `buildMergedDictionary(...)` and included it in the startup OSD sequencer's buffered progress set. This gives startup a visible dictionary-progress step even when snapshot checking/generation finished too early to still be relevant by the time annotation loading completes.
+
+<!-- SECTION:NOTES:END -->

backlog/tasks/task-146 - Forward-overlay-Tab-to-mpv-for-AniSkip.md

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+---
+id: TASK-146
+title: Forward overlay Tab to mpv for AniSkip
+status: Done
+assignee:
+  - codex
+created_date: '2026-03-09 00:00'
+updated_date: '2026-03-09 00:00'
+labels:
+  - bug
+  - overlay
+  - aniskip
+  - linux
+dependencies: []
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+
+Fix visible-overlay keyboard handling so bare `Tab` is forwarded to mpv instead of being consumed by Electron focus navigation. This restores the default AniSkip `TAB` binding while the overlay has focus, especially on Linux.
+
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+
+<!-- AC:BEGIN -->
+
+- [x] #1 Visible overlay forwards bare `Tab` to mpv as `keypress TAB`.
+- [x] #2 Modal overlays keep their existing local `Tab` behavior.
+- [x] #3 Automated regression coverage exists for the input handler and overlay factory wiring.
+<!-- AC:END -->
+
+## Implementation Plan
+
+<!-- SECTION:PLAN:BEGIN -->
+
+1. Add a failing regression around visible-overlay `before-input-event` handling for bare `Tab`.
+2. Add/extend overlay factory tests so the new mpv-forward callback is wired through runtime construction.
+3. Patch overlay input handling to intercept visible-overlay `Tab` and send mpv `keypress TAB`.
+4. Run focused overlay tests, typecheck, and changelog validation.
+<!-- SECTION:PLAN:END -->
+
+## Implementation Notes
+
+<!-- SECTION:NOTES:BEGIN -->
+
+Extracted visible-overlay input handling into `src/core/services/overlay-window-input.ts` so the `Tab` forwarding decision can be unit tested without loading Electron window primitives.
+
+Visible overlay `before-input-event` now intercepts bare `Tab`, prevents the browser default, and forwards mpv `keypress TAB` through the existing mpv runtime command path. Modal overlays remain unchanged.
+
+Verification:
+
+- `bun test src/core/services/overlay-window.test.ts src/main/runtime/overlay-window-factory.test.ts src/main/runtime/overlay-window-factory-main-deps.test.ts src/main/runtime/overlay-window-runtime-handlers.test.ts`
+- `bun x tsc --noEmit`
+<!-- SECTION:NOTES:END -->
+
+## Final Summary
+
+<!-- SECTION:FINAL_SUMMARY:BEGIN -->
+
+Visible overlay focus no longer blocks the default AniSkip `Tab` binding. Bare `Tab` is now forwarded straight to mpv while the visible overlay is active, and modal overlays still retain their own normal focus behavior.
+
+Added regression coverage for both the input-routing decision and the runtime plumbing that carries the new mpv forwarder into overlay window creation.
+
+<!-- SECTION:FINAL_SUMMARY:END -->

backlog/tasks/task-148 - Fix-Windows-plugin-env-binary-override-resolution.md

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+---
+id: TASK-148
+title: Fix Windows plugin env binary override resolution
+status: Done
+assignee:
+  - codex
+created_date: '2026-03-09 00:00'
+updated_date: '2026-03-09 00:00'
+labels:
+  - windows
+  - plugin
+  - regression
+dependencies: []
+priority: medium
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+
+Fix the mpv plugin's Windows binary override lookup so `SUBMINER_BINARY_PATH` still resolves when `SUBMINER_APPIMAGE_PATH` is unset. The current Lua resolver builds an array with a leading `nil`, which causes `ipairs` iteration to stop before the later Windows override candidate.
+
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+
+<!-- AC:BEGIN -->
+
+- [x] #1 `scripts/test-plugin-binary-windows.lua` passes the env override regression that expects `.exe` suffix resolution from `SUBMINER_BINARY_PATH`.
+- [x] #2 Existing plugin start/binary test gate stays green after the fix.
+
+<!-- AC:END -->
+
+## Final Summary
+
+<!-- SECTION:FINAL_SUMMARY:BEGIN -->
+
+Updated `plugin/subminer/binary.lua` so env override lookup checks `SUBMINER_APPIMAGE_PATH` and `SUBMINER_BINARY_PATH` sequentially instead of via a Lua array literal that truncates at the first `nil`. This restores Windows `.exe` suffix resolution for `SUBMINER_BINARY_PATH` when the AppImage env var is unset.
+
+Verification:
+
+- `lua scripts/test-plugin-binary-windows.lua`
+- `bun run test:plugin:src`
+
+<!-- SECTION:FINAL_SUMMARY:END -->