feat(desktop): redesign settings navigation and project editing

[usrnk1]

Issue for this PR

No linked issue.

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

• Reorganizes desktop Settings around client preferences, servers, and projects, with nested navigation and explicit back links.
• Replaces the project-edit dialog with autosaving settings. Startup scripts live in General alongside the name, icon, and color controls.
• Adds server shell/search preferences and the supporting global-preference and shell-discovery endpoints.
• Unifies settings spacing, navigation icons, and extension/provider/model lists; preserves WSL management actions.
• Adds a read-only project LSP list showing configured servers, file extensions, and enabled/disabled configuration.

How did you verify your code works?

• App and E2E typechecks, formatting, and all workspace pre-push typechecks passed.
• 38 targeted Playwright regressions passed, covering navigation, autosave/clearing, remote servers, WSL, LSPs, and narrow/RTL layouts.
• Compared production session-entry benchmarks before/after cleanup and captured the real settings UI with matching fixture data on origin/v2 and this branch.

Screenshots / recordings

Navigation and preferences

Before	After

Server settings

Before	After

Project settings and startup script

Before: separate General and Scripts tabs	After: autosaving General page

Extensions and shared lists

Before	After

Model list spacing

Before	After

New: configured language servers

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR