fix(tui): allow custom destination path in move session - #49560

Issue for this PR

Closes #49212
Closes #40200
Closes #43938
Closes #35306

Type of change

• Bug fix

What does this PR do?

The /move session command currently only surfaces worktrees of the current project and rejects destinations outside the project's worktree (DestinationProjectMismatchError). Searching for nested projects returns "No results found" (#49212), previously visited project directories never appear (#40200), the footer directory indicator stays stale after moving (#43938), and the palette description duplicates the command title (#35306).

This PR:

• Enables cross-project relocation: Extends moveSession to allow moving sessions to arbitrary directories and across distinct projects, updating SessionTable.project_id, persisting projectID on SessionEvent.Moved, and registering the destination in ProjectTable.
• Auto-creates missing directories: Destination paths are automatically created on disk via fs.ensureDir.
• Guards git patch transfer: Uncommitted git working-copy patch transfer is only applied within the same git repository, preventing cross-repo patch errors.
• Discovers all registered projects (Closes TUI "Move session" picker can't reach nested project directories; Search returns "No results found" #49212, Project dirs are not being recognized, nothing is listed under /move #40200): Queries sdk.client.project.list() and sdk.client.project.directories() to surface all registered project directories across the database under the "Other" section, allowing nested projects (e.g. /work/repos/HomeLab) and sibling projects to appear and match fuzzy search.
• Live directory autocompletion: Adds live directory autocompletion under a unified "Directories" section with root at the top and subdirectories sorted alphabetically, supporting Left/Right arrow directory traversal (➔ to drill down, ⬅ to move to parent) while preserving Tab navigation for footer action buttons.
• Path prompt via ctrl+m: Pressing ctrl+m ("new") opens DialogPrompt allowing the user to enter any target path directly, while falling back to automatic git worktree creation if left blank.
• Canonical casing & ~ expansion: Normalizes paths against true filesystem casing on disk via fs.realpathSync.native and expands ~ to the home directory.
• Fixes stale footer indicator (Closes tui: directory indicator stays stale after /move in a new session #43938): Updates useDirectory() in packages/tui/src/context/directory.ts to inspect the active session's directory. (Credit to @timrichardson for the earlier investigation in fix(tui): refresh directory after move [v2] #44829; this PR provides the active-session resolution for the current dev architecture in context/directory.ts).
• Palette description cleanup (Closes TUI move session command description is unclear #35306): Cleans up the command palette registration, removing redundant description text.

How did you verify your code works?

• Added schema contract tests in packages/schema/test/session-event.test.ts.
• Added live integration tests in packages/core/test/move-session.test.ts:
  moves session across distinct project repositories without transferring git changes.
  All 4 move-session tests pass (bun test test/move-session.test.ts).
• Added TUI component and context unit tests in packages/tui/test/component/dialog-move-session.test.ts (including mergeProjectDirectories) and packages/tui/test/context/directory.test.ts.
• Verified full monorepo typecheck: bun turbo typecheck passes cleanly across all 30 workspace packages.

Checklist

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