feat(memory): show a cue when memory forms

[fly1d]

Summary

• distinguish genuinely new auto-captured memories from updates, deduplicated adds, and archives
• notify the visible side panel only after the new memory is persisted and live memory state is refreshed
• show a localized, accessible cue in both Chrome and Firefox, with reduced-motion support

Tests

• memory-focused assertions in node test/run.js: pass
• npm run test:toolbar-guard: 33 passed
• npm run test:security: 60/60 passed
• full npm test: 1610 passed, with 2 failures already present on main because version 28.0.0 has no matching changelog entry or tracked Chrome 28.0.0 zip yet

Fixes #2733

[vercel]

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[esokullu]

Great! Thanks! I'll try this to see the actual visual effect.

[Copilot]

Pull request overview

Adds an accessible visual cue when a genuinely new memory is automatically persisted.

Changes:

• Distinguishes new memories from updates, archives, and deduplicated additions.
• Broadcasts the cue after persistence and memory-state synchronization.
• Adds localized toast styling, animation, reduced-motion support, and tests.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/run.js	Tests creation detection and cue wiring.
src/firefox/styles/sidepanel.css	Styles and animates the Firefox cue.
src/firefox/src/ui/sidepanel.js	Displays the Firefox cue.
src/firefox/src/background.js	Publishes Firefox creation notifications.
src/firefox/src/agent/user-memory.js	Reports newly created Firefox memories.
src/chrome/styles/sidepanel.css	Styles and animates the Chrome cue.
src/chrome/src/ui/sidepanel.js	Displays the Chrome cue.
src/chrome/src/background.js	Publishes Chrome creation notifications.
src/chrome/src/agent/user-memory.js	Reports newly created Chrome memories.

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