Handle non-git drafts in local mode

[SAKETH11111]

Closes #1914

What was broken

Draft threads could stay in New worktree mode for directories that are not Git repositories. On the first send, that pushed users into the base-branch guard even though the project could only run locally.

Root cause

The draft env-mode resolver treated persisted worktree mode as authoritative without considering the active project's Git status, so non-git drafts kept a worktree-only send path.

What changed

• fall back to local mode when the active project is known to be non-git
• normalize draft thread state away from stale worktree metadata for non-git projects
• add regression coverage for the shared env-mode resolver and the browser send flow

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