Refuse quitting with attached drives; neutral Canvas palette

[techartdev]

Two finished changes that had stayed uncommitted in the working tree, committed separately.

Refuse to quit with attached drives (9ce20ba)

• Bug: quitting with a local drive attached hid the window, while ShellCanvas and the Drive Bridge kept running with the drive mounted. Tauri destroys the window after a JavaScript onCloseRequested callback unless it prevents the default, even when Rust has already refused the close.
• Fix: the frontend now always prevents that automatic destroy and calls a new request_app_close command.
• request_app_close refuses while drives are attached. Otherwise it marks the desktop as closing under the attachment lock, so an attachment waiting on that lock cannot start once the window is gone.
• Windows: drive attachment also treats letters of remembered, disconnected network drives as reserved (WNetGetConnectionW). Mount cleanup still checks active mounts only.
• Companion bridge changes: the matching Drive Bridge changes live in the separate bridge repository (feat/graceful-detach, its PR Prepare public release and SDK distribution #1).

Neutral Canvas palette (398631a)

• The built-in Canvas theme moves to 1.1.0: neutral white and charcoal surfaces, blue accents, and a blue/indigo wallpaper in light and dark, replacing the green tint.
• Dock icons use neutral chrome with distinct app colors. Custom themes keep their own palette.
• The Canvas Study example theme and the preview terminal colors follow suit.

Verification

• npm run verify passed locally on this change set, before the CHANGELOG/doc wording edits: 303 frontend tests, frontend build, Rust workspace tests, Rust formatting and all-target Clippy. npm run public:check passed again after those edits.
• The drive close guard was confirmed by hand on Windows with an isolated profile: attach, refused detach and quit while busy, detach, then quit. The earlier native bridge suite also passed.
• Browser screenshots of the launcher and App Manager in light and dark (preview build) confirm the new palette works with the generic and packaged app icons.
• No hosted CI was triggered.

🤖 Generated with Claude Code

[Copilot]

🟡 Changes recommended

Duplicate close requests can clear the shutdown guard and reintroduce the attachment race.

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Pull request overview

Adds safe quit handling for attached drives and refreshes the built-in Canvas theme with a neutral palette.

Changes:

• Routes native close requests through a synchronized backend guard.
• Reserves disconnected Windows network-drive letters.
• Updates Canvas colors, icons, preview styling, tests, and documentation.

File summaries

File	Description
src/App.tsx	Routes close requests through the backend.
src-tauri/src/lib.rs	Adds synchronized application closing.
src-tauri/src/drive_mappings.rs	Blocks attachments during shutdown.
src-tauri/src/local_mounts.rs	Detects reserved network-drive letters.
src-tauri/Cargo.toml	Enables Windows networking APIs.
src/themes/theme.css	Adds neutral Canvas icon styling.
src/themes/model.ts	Updates the Canvas palette and version.
src/themes/model.test.ts	Updates built-in theme expectations.
src/preview.ts	Refreshes preview terminal colors.
examples/themes/canvas-study/shellcanvas.theme.json	Updates the example palette.
docs/themes.md	Documents the neutral theme.
docs/filesystem-integration-progress.md	Records drive lifecycle verification.
CHANGELOG.md	Announces both changes.

Review details

• Files reviewed: 13/13 changed files
• Comments generated: 2
• Review effort level: Balanced

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