Fix Canvas toolbar code host actions

[onevcat]

Summary

• Add the Normal toolbar status item to Canvas so the focused card shows PR/check status, toasts, or the time hint in the toolbar center.
• Route Open on Code Host / Open Pull Request and command palette PR entries through the Canvas focused card when Canvas is active.
• Document Canvas toolbar behavior and focused-card context for PR and command palette actions.

Verification

• xcodebuild test -project supacode.xcodeproj -scheme supacode -destination "platform=macOS" -only-testing:supacodeTests/CommandPaletteFeatureTests -only-testing:supacodeTests/AppFeatureCommandPaletteTests -only-testing:supacodeTests/WorktreeCommandsTests CODE_SIGNING_ALLOWED=NO CODE_SIGNING_REQUIRED=NO CODE_SIGN_IDENTITY="" -skipMacroValidation 2>&1 | xcsift -f toon
• make check 2>&1 | xcsift -f toon
• make build-app 2>&1 | xcsift -f toon
• Self-verify: launched a separate debug app with PROWL_CLI_SOCKET=/tmp/prowl-self-verify.sock, opened this repo through the repo-built CLI, and confirmed the debug instance responded to Canvas view-mode shortcut routing in its log. Window screenshot capture was unavailable for that debug window in this environment.

[Copilot]

Pull request overview

This PR fixes Code Host–related actions when the Canvas view is active by ensuring “Open on Code Host / Open Pull Request” and Command Palette PR actions use the focused Canvas card’s worktree as their context. It also brings the Normal-view toolbar status center (PR/check summary/toasts/time hint) into Canvas and documents the focused-card context behavior.

Changes:

• Add the Normal toolbar center status content to Canvas, driven by the focused worktree (toast + PR status + code host).
• Route “Open on Code Host / Open Pull Request” and Command Palette PR entries through the Canvas focused worktree when Canvas is active.
• Add/extend tests and documentation for Canvas-focused action context.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
supacodeTests/WorktreeCommandsTests.swift	Adds unit coverage for resolving Code Host action worktree ID in Canvas mode and gating on Code Host capability.
supacodeTests/CommandPaletteFeatureTests.swift	Adds test ensuring Command Palette surfaces Code Host/PR actions for a Canvas-focused action target.
supacode/Features/Repositories/Views/WorktreeDetailView.swift	Introduces a Canvas toolbar state model and adds a .principal status item in Canvas matching Normal view behavior.
supacode/Features/CommandPalette/Reducer/CommandPaletteFeature.swift	Extends Code Host item generation to accept an action-target worktree ID (Canvas-focused context).
supacode/Commands/WorktreeCommands.swift	Injects WorktreeTerminalManager and resolves “Open on Code Host” target via Canvas focus when Canvas is active; adds helper function.
supacode/App/supacodeApp.swift	Wires terminalManager into WorktreeCommands initialization.
docs/components/github-pull-requests.md	Documents that PR-related actions can use Canvas focused-card context.
docs/components/command-palette.md	Notes that worktree-scoped actions in Canvas use the focused card as context.
docs/components/canvas.md	Documents Canvas toolbar behavior and focused-card routing for Code Host actions.

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