Support native editing in Agent prompt

[h4yfans]

Summary

• Add native Select All to the Electron Edit menu.
• Show an Electron native edit context menu for editable targets only.
• Cover Agent composer keyboard edit flows, main-process menu behavior, i18n menu keys, and docs.

Verification

• pnpm --dir apps/desktop exec vitest run --config config/vitest.config.ts --project main src/main/menu.test.ts src/main/index.phase2.test.ts
• pnpm --dir packages/i18n exec vitest run src/main/menu-namespace.test.ts
• pnpm --dir apps/desktop exec playwright test --config config/playwright.config.ts tests/e2e/agent-chat-text-editing.e2e.ts
• pnpm --dir apps/desktop typecheck:node
• pnpm --filter @memry/desktop i18n:check
• pnpm docs:impact --base 76ac618631b6c4128b25fec3691711cbf04e1feb --strict
• pnpm docs:build
• git diff --check

[vercel]

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Project	Deployment	Actions	Updated (UTC)
memry-docs	Ready	Preview, Comment	May 12, 2026 10:14pm
memrynote-landing	Ready	Preview, Comment	May 12, 2026 10:14pm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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