Add customizable commit message instructions in settings

[riccardopll]

What Changed

This PR adds a small setting for customizing auto-generated git commit messages. It introduces a new local app setting, exposes it on the Settings page under Agent Instructions and uses it on the server only when a commit message is being generated automatically.

Why

I like the commit button but I also prefer Conventional Commits, so this felt like a useful feature.

UI Changes

Before:

After:

Checklist

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

Note

Add customizable commit message instructions to settings and git action generation

• Adds a new commitMessageInstructions field to AppSettingsSchema, capped at 2,000 characters, and exposes a textarea in the settings page for users to configure it.
• Threads the instructions from settings through GitActionsControl → gitRunStackedActionMutationOptions → runStackedAction native API → GitManager → CodexTextGeneration, where they are injected as bullet-point rules in the commit message prompt.
• Extends GitRunStackedActionInput schema to accept and validate the optional commitMessageInstructions field with trimming and max-length enforcement.
• Behavioral Change: non-empty commit message instructions will alter the subject, body, and branch name output from Codex for all agent-triggered git actions.

^{Macroscope summarized cd9a57f.}

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