chore(desktop): separate dev AppUserModelID on Windows

[adammansfield]

What Changed

Assigned a separate Windows AppUserModelID to the desktop dev build.

Why

This gives bun dev:desktop its own Windows taskbar icon group instead of the same grouping under the packaged T3 Code.

Fixes #265 in a narrower scope by only changing the dev workflow, leaving the more production-like bun start:desktop Windows app identity unchanged.

This is similar to #1806, but for Windows.

UI Changes

Before:
T3 Code (Dev) and Developer Tools share the same Taskbar icon group with T3 Code (Alpha).

After:
T3 Code (Dev) and Developer Tools get their own Taskbar icon group.

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 -- no animation changes

Validation

• bun fmt
• bun lint
• bun typecheck
• bun dev:desktop
• bun start:desktop

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Note

Low Risk
Low risk: a small, dev-only change to the Windows AppUserModelID that affects taskbar icon grouping but not app logic or data handling.

Overview
Adjusts the desktop app’s Windows identity so development builds use a distinct AppUserModelID (com.t3tools.t3code.dev) while packaged/non-dev builds keep com.t3tools.t3code.

This prevents bun dev:desktop from sharing the same Windows taskbar icon group as the packaged app.

^{Reviewed by Cursor Bugbot for commit d1b2a8f. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Use separate Windows AppUserModelID for dev builds of desktop app

Changes APP_USER_MODEL_ID in main.ts to com.t3tools.t3code.dev when running in development mode, keeping com.t3tools.t3code for production. This prevents dev and production instances from sharing the same Windows taskbar identity.

^{Macroscope summarized d1b2a8f.}

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[macroscopeapp]

Approvability

Verdict: Approved

A trivial configuration change that applies an existing development/production differentiation pattern to the Windows AppUserModelID. Production behavior is unchanged; this only affects local development builds to better separate them from production instances.

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