Add native text and sticker editing to photo stories

[CountableNewt]

Photo review now supports native styled text, emoji, and static image stickers on iOS and Android. Users can move, resize, rotate, align, delete, and undo layers, then restore the editable composition after relaunch.

The original image and a versioned recipe remain local. Native rendering produces one JPEG; the first publish attempt freezes that JPEG and its record key so retries cannot silently change the story. Existing photo-only drafts remain supported. Includes bounded image imports, accessible layer controls, Room migration, and regression coverage for text-input synchronization and draft/export behavior.

Validation:

• iOS: build and 39 tests passed; simulator text, emoji, Photos picker import, drag, delete/undo, and stop/relaunch restoration verified.
• Android: isolated committed source passed all 34 unit tests, debug build, and lint. Native instrumentation edit and force-stop/relaunch phases passed. The working checkout with existing unrelated edits also passed all 41 tests.
• Web check/build and Go tests/build passed.
• Physical-device camera and image keyboards, photo-library saving, and authenticated PDS publishing remain release acceptance checks. No story was posted and no release was deployed.

This PR retains the existing branch and includes its earlier feedback-board links commit. Pre-existing uncommitted marketing/deployment, Android permission, and release-configuration work is excluded and preserved locally.

Tracks PRSTLY-1.