feat(web): add branch deletion from the branch picker

[imabdulazeez]

What Changed

Adds the ability to delete a git branch directly from the branch picker in the branch toolbar.

• New vcsDeleteBranch RPC method wired across contracts, server, and client (rpc.ts, ipc.ts, git.ts, wsRpcClient.ts, ws.ts).
• Implemented in the Git VCS driver (GitVcsDriverCore.ts, GitVcsDriver.ts, GitWorkflowService.ts).
• Trash icon in the branch picker (BranchToolbarBranchSelector.tsx) with a confirmation dialog before deleting.
• Force-delete path for branches that have unmerged commits.
• New deleteRemoteBranchOnDelete setting (settings.ts, SettingsPanels.tsx) that controls whether the matching remote branch is also deleted.

Why

There was no way to delete a branch from within the app — you had to drop to a terminal. Branches accumulate after merges/abandoned work, and the branch picker is the natural place to clean them up. The optional remote-cleanup setting keeps the destructive remote action opt-in rather than implicit.

UI Changes

Delete button
Delete confirmation popup
Settings menu

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes (only after screenshots applicable)
• I included a video for animation/interaction changes

Note

Add branch deletion from the branch picker in the web UI

• Adds a delete button per branch in BranchToolbarBranchSelector that calls a new vcs.deleteBranch RPC endpoint; shows a confirmation dialog before proceeding.
• Supports optional remote branch deletion controlled by a new deleteRemoteBranchOnDelete client setting (defaults to true), configurable via the General settings panel.
• If the initial delete fails with a GitCommandError, a second dialog offers a force-delete fallback.
• Implements the full stack: new contract schemas in git.ts, RPC wiring in rpc.ts, Git driver implementation in GitVcsDriverCore.ts, and WS handler in ws.ts. Missing remote branches are treated as non-fatal.
• Risk: deleteRemoteBranchOnDelete defaults to true, so existing users will have remote deletion enabled by default after upgrade.

^{Macroscope summarized 30507a0.}

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[macroscopeapp]

Approvability

Verdict: Needs human review

Unable to check for correctness in 30507a0. This PR introduces a complete new feature (branch deletion from UI) with new git operations, RPC endpoints, UI components (delete buttons, confirmation dialogs), and settings. New features with significant user-facing behavior warrant human review.

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