refactor(notebook): remove tool availability checks

[rgbkrk]

Summary

Removes vestigial tool availability checks from the notebook frontend. The daemon now handles all tool detection (uv, deno) and bootstrapping during kernel launch, making the frontend-side "tool not found" banners redundant.

Changes:

• Remove Tauri commands: check_uv_available, check_deno_available
• Remove frontend state tracking: uvAvailable, denoAvailable
• Remove "Tool not found" banners from dependency headers
• Drop unused kernel-env dependency from notebook crate
• Simplify environment type detection logic in App.tsx

Protocol types (CheckToolAvailable, ToolAvailable) remain in the daemon for potential future use (e.g., onboarding UI).

Verification

• No "uv not found" or "Deno not found" banners appear in the UI
• UV dependency management works as before
• Deno kernel launch works as before
• Environment detection (uv/conda/pixi) still selects correct panels

PR submitted by @rgbkrk's agent, Quill

[Copilot]

Pull request overview

Removes frontend-side UV/Deno tool availability checks and related UI banners in the notebook app, relying on the daemon to handle tool detection/bootstrapping during kernel launch.

Changes:

• Removed Tauri commands check_uv_available and check_deno_available from the notebook crate.
• Removed frontend uvAvailable / denoAvailable state and “tool not found” banners from dependency headers.
• Dropped the unused kernel-env dependency from crates/notebook.

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
crates/notebook/src/uv_env.rs	Removes notebook-side UV availability helper and updates module docs to reflect daemon ownership.
crates/notebook/src/lib.rs	Deletes the two Tauri commands and removes them from the invoke handler list.
crates/notebook/Cargo.toml	Removes the kernel-env dependency from the notebook crate.
apps/notebook/src/hooks/useDependencies.ts	Eliminates uvAvailable state and the check_uv_available invoke on mount.
apps/notebook/src/hooks/useDenoDependencies.ts	Eliminates denoAvailable state and the check_deno_available invoke on mount.
apps/notebook/src/components/DependencyHeader.tsx	Removes the “uv not found” banner and associated prop wiring.
apps/notebook/src/components/DenoDependencyHeader.tsx	Removes the “Deno not found” banner and stops gating UI on availability.
apps/notebook/src/App.tsx	Removes availability plumbing and simplifies env-type selection logic accordingly.
Cargo.lock	Updates lockfile after removing kernel-env from crates/notebook.

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