Task: Integrate native Android display

Identity

Adopt and integrate the completed native Android display work already present in the main worktree.
Include the native overview and project screens, public display API client, detail-only announcements, embedded Mandarin WAV playback, 1920 x 1080 landscape behavior, range-number fitting, tests, and the updated debug APK.
Preserve the existing responsive Web display adjustment that was developed and verified in the same adopted worktree.
Carry the source task's task-owned evidence into version control without rewriting its historical record.

The user explicitly authorized taking over the existing changes and later requested that they be merged and pushed to main.
origin/main and local main both pointed to e4e3e6a735c1a1a485d87a979b80c1ebe5803b6f when integration began.
The overview screen must never announce. Only /display/{project-code} may poll announcement state and play audio.
Audio must use the APK's embedded Mandarin PCM assets and repeat each announcement three times; it must not depend on Android TTS.
A batch range such as 00010 至 00011 must remain complete, single-line, and unellipsized on the supported Android UI.
Source task records are retained as historical evidence. Canonical project-memory promotion will be completed from a clean follow-up Integration task whose base includes this bootstrap commit, because the source task's previously uncommitted task-owned documents are foreign to this Integration task's base.

Prepared one bootstrap integration unit containing the adopted product changes, deliverable APK, source task record, evidence, and reflection.
Canonical project-memory promotion and remote push remain pending.

Android: clean testDebugUnitTest lintDebug assembleDebug passed with 56 tests, zero failures, and zero lint errors.
Web: 66 Vitest tests and production build/typecheck passed during the source task.
Server: go test ./... passed during the source task.
APK: versionCode 9 / versionName 1.5.2, minSdk 23, targetSdk 36, v1/v2 signatures valid.
Source and deliverable APK SHA-256 matched 0D56C10B8CE706893F3EA8E59B21329847517F56F7347ABEA127AB30C6C71D77.
Independent range-display review found no P0/P1 code or APK blocker; the remaining blocker was only the project-document ownership transition addressed by this bootstrap step.

Start a follow-up Integration task at the bootstrap commit, promote durable facts into canonical project memory, run the final documentation gate, obtain a fresh read-only review, and push main.

Native Android Views are the supported large-screen application implementation; the Web display remains a separate browser surface.
The snapshot response is the single source for project-screen UI and announcement state.
Announcement lifecycle is structurally detail-only, with cancellation when leaving the project screen or pausing the Activity.
Embedded PCM assets and AudioTrack streaming replace device TTS for appliance compatibility.