feat(docker): support project-specific Dockerfiles

[ASRagab]

Summary

• detect and build project-specific Dockerfiles from .parallel-code/Dockerfile
• pass an explicit project build context into Docker builds instead of inferring from the Dockerfile directory
• track Docker source explicitly (default | project | custom) instead of inferring UI state from image-tag prefixes
• harden Docker image checks for unreadable custom Dockerfiles and clean up the new-task / Docker UI flow
• ignore repo-local .worktrees/** in Electron Vite dev mode so task creation does not trigger renderer reloads

Validation

• npm run compile
• npm run lint
• npm test
• npm run typecheck

[Copilot]

Pull request overview

Adds first-class support for project-specific Dockerfiles by detecting .parallel-code/Dockerfile, building with an explicit project build context, and persisting an explicit Docker source (default | project | custom) so the UI no longer infers state from image-tag prefixes.

Changes:

• Introduces DockerSource metadata on tasks and persistence migration to infer it for legacy tasks.
• Adds project Dockerfile resolution + deterministic project image tagging and updates Docker image existence/build flows to accept custom Dockerfile/build-context inputs.
• Prevents Electron Vite dev server from reloading when repo-local .worktrees/** changes.

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/store/types.ts	Persists dockerSource on Task and PersistedTask.
src/store/tasks.ts	Threads dockerSource through task creation options into stored task state.
src/store/persistence.ts	Saves/loads dockerSource and infers it for legacy persisted tasks.
src/lib/docker.ts	Adds shared Docker constants + docker source inference and UI label helpers.
src/lib/docker.test.ts	Adds label tests for docker display helpers.
src/components/TaskTitleBar.tsx	Shows Docker badge label derived from dockerSource and adds image title tooltip.
src/components/TaskAITerminal.tsx	Refactors InfoBar status logic and updates Docker overlay label from dockerSource.
src/components/SettingsDialog.tsx	Uses shared default image constant and documents project Dockerfile behavior.
src/components/NewTaskDialog.tsx	Detects project Dockerfile via IPC, adjusts image checks/build args, and persists docker source/image appropriately.
eslint.config.js	Ignores Electron Vite config test file for linting.
electron/vite.config.electron.ts	Ignores **/.worktrees/** in dev watch to avoid renderer reloads during task creation.
electron/vite.config.electron.test.ts	Tests that Vite watch ignores nested .worktrees directories.
electron/tsconfig.json	Excludes Electron Vite config + its test from Electron TS config compilation.
electron/preload.cjs	Allows new resolve_project_dockerfile IPC channel.
electron/ipc/register.ts	Adds IPC handlers/arg validation for resolving project Dockerfiles and for docker image checks/builds with optional inputs.
electron/ipc/pty.ts	Adds project dockerfile resolution + hashing/tagging; extends docker image checks/builds; updates container HOME to /tmp.
electron/ipc/pty.test.ts	Adds/extends tests for docker HOME behavior and new dockerfile/hash/build context helpers.
electron/ipc/channels.ts	Defines ResolveProjectDockerfile IPC channel.
.prettierignore	Ignores additional repo-local files.

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[Copilot]

The folder emoji is rendered as a literal character. For better accessibility/screen-reader behavior, consider using a real icon component or marking the emoji aria-hidden and providing an accessible text label.

Suggested change

	<span>📁</span>
	<span aria-hidden="true">📁</span>

[ASRagab]

Resolved the merge conflict with upstream/main and addressed all review comments:

1. fileNameFromPath cross-platform split — now splits on both / and \ via /[\\/]/
2. resolveProjectDockerfile file-type check — uses statSync().isFile() instead of bare existsSync to reject directories and non-regular files
3. inferDockerSource test coverage — added cases for default image, project prefix, custom tag, and undefined
4. Emoji accessibility — added aria-hidden="true" to the folder emoji span

[johannesjo]

Thank you very much! <3

[johannesjo]

Reviewed the diff including the follow-up addressing all 4 Copilot comments (cross-platform path split, statSync().isFile(), inferDockerSource test coverage, aria-hidden). Those are all correctly resolved.

One new issue worth flagging:

One-way Docker ratchet in NewTaskDialog

createEffect(() => {
  if (skipPermissions() && store.dockerAvailable) {
    setDockerMode(true);
  }
});

This auto-enables Docker when "skip permissions" is checked, but has no inverse — unchecking skip-permissions leaves Docker mode on. The user would have to manually uncheck Docker mode. If this is intentional (i.e. skip-permissions always implies Docker), a comment would clarify the intent. If unintentional, the effect should also handle the reverse:

createEffect(() => {
  if (skipPermissions() && store.dockerAvailable) {
    setDockerMode(true);
  } else if (!skipPermissions()) {
    setDockerMode(false);
  }
});

(Or drop the effect entirely and rely on the existing "Enable Docker" suggestion UI that was already shown when skip-permissions was active.)

Everything else looks good — the buildDockerImage deduplication logic, IPC validation, dockerSource persistence migration, and cleanup handling in createEffect are all solid.

[johannesjo]

All four original Copilot review comments were correctly addressed. One UX issue before merge:

One-way Docker ratchet — in NewTaskDialog, a createEffect auto-enables Docker when 'skip permissions' is checked, but there is no inverse: unchecking 'skip permissions' leaves Docker enabled. This can silently enable Docker mode for users who toggle that checkbox and then change their mind. Consider adding the inverse side-effect, or making the coupling explicit in the UI. Details in the review comment.

The rest of the PR (Dockerfile detection, DockerSource migration, Vite watch fix) is well-implemented.