fix(mobile): optional toggle to dim agent directory-listing size tokens

[innocarpe]

Summary

• Adds an opt-in Terminal setting on mobile that visually dims trailing file-size tokens (1.4K, 738B, 45.9K, …) in agent directory listings.
• Visual-only xterm decorations — selection, copy, and the PTY buffer stay byte-identical.
• Off by default; persists per device like the autocomplete toggle.

Fixes

Closes #10508

Test plan

• Unit tests: preference load/save + subscriber; size-token matcher
• Manual: enable Settings → Terminal → Dim file sizes; open agent listing; sizes look dimmed; copy still includes sizes

ELI5

Mobile terminals can optionally dim trailing file-size tokens in directory listings so agent ls output is easier to read. It's visual-only and off by default.

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds a persisted “Dim file sizes” terminal preference with load, save, and subscription APIs. The terminal WebView receives preference updates through a new bridge command and applies injected decoration logic to trailing directory-listing size tokens. Decorations refresh after terminal writes and scrolling and clear during disposal. Tests cover preference persistence and notifications, token parsing, invalid inputs, and trailing whitespace.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description covers summary and testing, but omits required template sections like Screenshots, AI Review Report, Security Audit, and Notes.	Add the missing template sections, especially Screenshots, AI Review Report with cross-platform checks, Security Audit, and Notes.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The changes add the mobile toggle, persist it, inject visual-only dimming, and keep selection/copy unchanged as requested for #10508.
Out of Scope Changes check	✅ Passed	All changed files support the new terminal dimming feature; no unrelated or desktop-impacting changes are evident.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Title check	✅ Passed	The title clearly matches the main change: adding an optional mobile toggle to dim directory-listing size tokens.

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[coderabbitai]

Actionable comments posted: 3

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: f8740e19-6c19-4cc9-adf8-fa8a82d91090

📥 Commits

Reviewing files that changed from the base of the PR and between 9eff372 and 8be0975.

📒 Files selected for processing (9)

• mobile/app/terminal-settings.tsx
• mobile/src/storage/preferences.test.ts
• mobile/src/storage/preferences.ts
• mobile/src/terminal/TerminalWebView.tsx
• mobile/src/terminal/terminal-dir-listing-size-dim-injected.ts
• mobile/src/terminal/terminal-dir-listing-size-dim.test.ts
• mobile/src/terminal/terminal-dir-listing-size-dim.ts
• mobile/src/terminal/terminal-webview-html.ts
• mobile/src/terminal/terminal-webview-messages.ts

[innocarpe]

Sync update (23a839b96)

Address CodeRabbit: dispose IMarkers with decorations, tint size-dim overlays from terminalTheme.background (+ refresh on set-theme), subscribe before initial load so a live toggle cannot be overridden by a stale AsyncStorage read.

• Commit: 23a839b96ead72eda44c6e85eb1e29d605d2a2e0
• Upstream: fix(mobile): optional toggle to dim agent directory-listing size tokens #10603
• Fork portfolio: [upstream #10603] fix(mobile): optional toggle to dim agent directory-listing size tokens innocarpe/orca#82