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gsxdsm 46232118e1 FN-7253: add worktree picker to terminal sessions

Terminal sessions can now start from a selected safe project worktree.

- Add a Terminal modal worktree selector with searchable branch/path context and responsive styling.
- Thread worktree selection through session hooks, terminal routes, and terminal service creation.
- Centralize safe git worktree discovery and reuse it from git and terminal routes.
- Cover the picker, hook behavior, service worktree validation, and route wiring with tests.
- Document the terminal worktree picker and add a release changeset.

Files changed:
 .changeset/fn-7253-terminal-worktree-picker.md     |   7 +
 docs/dashboard-guide.md                            |  13 +-
 .../dashboard/app/components/TerminalModal.css     | 189 +++++++++++++++-
 .../dashboard/app/components/TerminalModal.tsx     | 190 ++++++++++++++++-
 .../components/__tests__/TerminalModal.test.tsx    | 169 +++++++++++++++
 .../hooks/__tests__/useTerminalSessions.test.ts    | 237 ++++++++++++++++++++-
 .../dashboard/app/hooks/useTerminalSessions.ts     |  59 +++--
 .../src/__tests__/routes-automation.test.ts        |  37 ++--
 .../src/__tests__/terminal-service.test.ts         | 125 +++++++++++
 packages/dashboard/src/git-worktree-safety.ts      | 113 ++++++++++
 .../dashboard/src/routes/register-git-github.ts    |  54 +----
 .../src/routes/register-messaging-scripts.ts       |   1 +
 .../src/routes/register-terminal-routes.ts         |   1 +
 packages/dashboard/src/terminal-service.ts         |  66 ++++--
 14 files changed, 1157 insertions(+), 104 deletions(-)

Fusion-Task-Id: FN-7253

Fusion-Task-Lineage: 6a0c0b4f-74cc-42b3-8bbd-2ca94c4c26d9

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-06-30 00:03:37 -07:00