refactor: isolate TUI runtime state

[mohitranka]

Summary

• Group pointer hit regions, frame generations, and double-click tracking into PointerState.
• Group filesystem watcher ownership and event channels into FileWatchState.
• Group repository-header cache, refresh state, TTL, and cwd tracking into RepoHeaderState.
• Preserve existing keyboard, mouse, watcher, render, and async refresh behavior.

Validation

• cargo fmt --all -- --check
• cargo test -p forge-tui --lib --locked (683 passed)
• cargo clippy -p forge-tui --all-targets --locked -- -D warnings
• git diff --check

Summary by CodeRabbit

• Refactor
  • Consolidated file-watching, pointer interaction, and repository-header state management.
  • Preserved existing repository refresh, filesystem monitoring, mouse hit detection, and double-click behavior.
• Tests
  • Updated coverage for repository refresh failures, cached data retention, pointer interactions, and file-change events.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: edd5b04c-695d-4618-bad6-578ae3f59736

📥 Commits

Reviewing files that changed from the base of the PR and between 7d7978c and b323a1e.

📒 Files selected for processing (10)

• crates/forge-tui/src/app/chrome.rs
• crates/forge-tui/src/app/mouse.rs
• crates/forge-tui/src/app/new.rs
• crates/forge-tui/src/app/tests/chrome.rs
• crates/forge-tui/src/app/tests/edge.rs
• crates/forge-tui/src/app/tests/helpers.rs
• crates/forge-tui/src/app/tests/pointer.rs
• crates/forge-tui/src/app/tests/watch.rs
• crates/forge-tui/src/app/types.inc.rs
• crates/forge-tui/src/app/watch.rs

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📝 Walkthrough

Walkthrough

Changes

The TUI application now groups file-watcher, pointer, and repository-header fields into dedicated state structures. Runtime code and tests use the nested state fields. Existing refresh, hit-resolution, double-click, and file-change behavior remains unchanged.

TUI state consolidation

Layer / File(s)	Summary
State structures and initialization crates/forge-tui/src/app/types.inc.rs, crates/forge-tui/src/app/new.rs	FileWatchState, PointerState, and RepoHeaderState replace standalone TuiApp fields and are initialized during app creation.
Repository-header state flow crates/forge-tui/src/app/chrome.rs, crates/forge-tui/src/app/tests/chrome.rs	Repository-header caching, refresh tracking, receiver assignment, and related tests use RepoHeaderState.
Pointer state access crates/forge-tui/src/app/mouse.rs, crates/forge-tui/src/app/tests/helpers.rs, crates/forge-tui/src/app/tests/pointer.rs	Hit regions, frame generations, and pending double-click candidates use PointerState.
File-watch state access crates/forge-tui/src/app/watch.rs, crates/forge-tui/src/app/tests/edge.rs, crates/forge-tui/src/app/tests/pointer.rs, crates/forge-tui/src/app/tests/watch.rs	Watcher handles and change channels use FileWatchState, including file-change test events.

Estimated code review effort: 2 (Simple) | ~15 minutes

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch refactor/tui-pointer-state

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