feat(tui): add semantic file path truncation

[kitlangton]

Summary

• add a reusable FilePath TUI component backed by a pure terminal-column truncation function
• preserve the filename, nearest complete parent segments, separator style, absolute roots, grapheme boundaries, and filename extensions
• migrate Modified Files, workspace file-change confirmation, reverted-file rows, the home footer, and block tool file titles
• derive path budgets from the available terminal/session width after fixed labels, counters, MCP status, and version text
• retain OpenTUI native truncation as a final guard when Yoga allocates less width than the caller budget

Examples

packages/tui/src/ui/dialog-select.tsx
…/src/ui/dialog-select.tsx
…/ui/dialog-select.tsx
…/dialog-select.tsx
…/dialog-se….tsx

Verification

• bun run test test/ui/file-path.test.ts: 8 passed
• bun run test: 235 passed, 1 skipped
• bun typecheck: passed
• repository push hook: 31 package typechecks passed
• git diff --check: passed

Visual verification

Responsive screenshots

Home footer at 64 columns

Pending patch with spinner

Completed patch at 100 columns

Session with the fixed 38-column sidebar footer and no inline session ID

Reverted file at 72 columns

A deterministic Drive script now creates a real Git baseline using anomalyco/opencode-drive#7, invokes OpenCode’s production patch tool, and runs /undo through Snapshot.Service and SessionRevert.

The final recording verifies:

• the home footer remains one line at 86 and 64 columns
• the patch title remains one line at 100 columns
• the reverted-file row uses the available width and shows the complete fixture path at 100 columns
• narrower paths preserve the basename and nearest complete parent segments

The script remains outside this branch at /tmp/opencode-drive-git-project-proof.ts; no fixture or media artifacts are committed.

The real Modified Files sidebar remains blocked independently by #36351 because V2 does not currently populate session_diff.

File tool presentation

The final recording also verifies that block file-tool headers align with shell-card content, use spinner + Patching while pending, switch to ← Patched <path> when complete, and visibly compact the same long path across 150, 100, and 72-column viewports.

Sidebar footer

The fixed 38-column sidebar footer now renders its project directory as one compacted line while retaining the existing muted-parent and bright-basename treatment. Home-relative paths retain ~/ when they fit and use the normal ellipsis compaction when they do not.