feat(extensions): add four-edge panes and current-line paint

[benvinegar]

Summary

• generalize extension sidebars into host-owned panes dockable on the left, right, top, or bottom
• use an explicit width contract for left/right panes and height contract for top/bottom panes
• add opt-in opaque current-line paint for extension panes without exposing renderer internals
• preserve existing sidebar APIs as deprecated aliases while keeping pane geometry outside the review stream
• migrate bundled file navigation to the public pane API and add installable pane-layout and current-line-lens examples
• remove product-level line-lens config, CLI flags, menu commands, and bundled registration so the lens remains example-only

Closes #638.

Testing

• bun run format
• bun run typecheck
• bun run lint
• bun run check:docs
• bun run build:npm
• bun run check:pack
• bun run website:build
• bun test ./src ./packages ./test/cli ./test/session — 1,956 passed, 9 skipped
• bun run test:integration — 105 passed
• bun run test:tty-smoke — 9 passed
• real PTY coverage loads the current-line lens from examples/extensions/current-line-lens/

This PR description was generated by Pi using gpt-5.6-sol

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Project	Deployment	Actions	Updated (UTC)
hunk-web	Ready	Preview	Aug 11, 2026 5:08pm

[benvinegar]

@greptile-ai review

[benvinegar]

@greptile-apps review

This comment was generated by Pi using gpt-5.6-sol

[greptile-apps]

Greptile Summary

The PR generalizes extension sidebars into host-planned panes on all four terminal edges and adds an optional current-line lens using the public pane API.

• Adds API-v4 pane registration, sizing, availability, replacement, compatibility aliases, and host-side failure containment.
• Introduces four-edge layout planning, resizing, current-line painting, and bundled files/lens panes.
• Updates configuration, commands, examples, package checks, documentation, and extensive unit and TTY coverage.

Confidence Score: 5/5

The PR appears safe to merge; no concrete blocking or independently actionable non-blocking issues remain.

The pane planner preserves minimum review bounds, extension failures are contained with replacement fallback, and current-line paint is derived from and invalidated with the authoritative row plan.

Important Files Changed

Filename	Overview
src/ui/lib/extensionPanes.ts	Plans exact four-edge pane and divider rectangles, preserving minimum review dimensions and containing availability failures.
src/ui/App.tsx	Integrates pane state, layout, resizing, quarantine fallback, current-line paint flow, commands, menus, and persisted lens preferences.
src/ui/components/panes/ExtensionPane.tsx	Mounts pane components in host-owned rectangles with guarded actions, memoized props, and registration-scoped error containment.
src/ui/components/panes/DiffPane.tsx	Resolves current-line paint from the accepted split-row plan without adding pane geometry to the review stream.
src/ui/lib/extensionCurrentLine.tsx	Converts the selected split row into an immutable, clipped old/new painter for opted-in panes.
src/extension-api/types.ts	Publishes the API-v4 pane contracts while retaining deprecated sidebar aliases.
src/extensions/runExtension.ts	Adds pane registration and compatibility normalization to the extension factory lifecycle and rollback behavior.
src/extensions/apply.ts	Resolves registered panes into the runtime registry with stable extension-qualified identities.
src/extensions/default/ui/line-lens/index.tsx	Registers the bundled fixed-height bottom lens using current-line availability and opaque rendering.
src/core/config.ts	Adds line-lens defaults, layered configuration resolution, and persisted preference serialization.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  R[Extension registrations] --> A[Registry and apply path]
  A --> S[Session pane model]
  S --> P[Four-edge rectangle planner]
  P --> L[Left and right panes]
  P --> H[Top and bottom panes]
  P --> D[Residual DiffPane bounds]
  D --> C[Accepted current-line row plan]
  C --> O[Opaque current-line painter]
  O --> H

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