[FEATURE]: Add project-scoped session switcher to Desktop command palette

Feature hasn't been suggested before.

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Describe the enhancement you want to request

TLDR

Browsable current-project session list with keyboard navigation in Desktop App

why: You can't to access past sessions of the current project easily. On the home page mouse usage is required both for project selection without a filter and session selection. TUI experience is much better in this regard.

To sell you the idea - Try to open the session you worked on last time in any project. Assuming it's not in the sidebar already - how would you do this? Try without a mouse

Where I'm coming from

In Desktop, browsing sessions from the current project requires returning Home, selecting the project, and then selecting a session with a mouse, you can't just go through past sessions of the current project with keybinds. Cmd+K can find a session when I remember its title, but it does not provide a browseable current-project session list.

Every time I need to check something from my past session I have to break my flow, take my mouse and go click around the app because you can't browse sessions with keybindings

The TUI already has "Switch session" (/sessions, l), scoped to the current project. Desktop could expose equivalent behavior as a Switch session command that opens a searchable list of recent sessions for the active project. The command should also be assignable to a keybinding.

Ways to solve this

Easy to implement: auto-select project of currently open session on the Home page. This way at least you don't have to search for your project and see the sessions instantly after pressing cmd+B

Better one: navigation with keybinds between the sessions for the home page and quick project select there

Alternatively: matching TUI behavior add per-project filtered session list as a command

Hopefully this is not a duplicate, really hard to search through this many issues. My agent could not find similar request.