Git init: prompt for branch + create GitHub remote

[Samigos]

Adds an Initialize Git flow for non-git workspaces.

• Prompts for initial branch every time.
• Initializes repo, creates an initial commit.
• Optional: create a GitHub repo via gh, add origin, push HEAD, set default branch.
• Makes the init modal opaque (no transparency) and fixes layering via DS z-index tokens.
• Includes remote-mode (daemon) wiring + invoke wrapper test.

Tests:

• npm run typecheck
• npm test
• npm run lint
• cargo check (src-tauri)

[Samigos]

@codex review

[chatgpt-codex-connector]

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Reviewed commit: e700876164

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[chatgpt-codex-connector]

Don't treat canceled init confirmation as failure

handleInitGitRepoPromptConfirm sets an error whenever initGitRepo(...) returns false, but useGitActions.initGitRepo also returns false for the intentional cancel path when the non-empty-folder ask(...) dialog is declined. In that scenario the UI now shows “Failed to initialize Git repository.” even though no operation failed, which is misleading and degrades the init flow UX. Please distinguish cancel vs. failure before setting this error.

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