feat: wire up selected_template_id as default enhance template

[quintusman]

Summary

• The selected_template_id field already exists in ConfigGeneral (Rust backend) but was never read by the desktop frontend
• This PR wires it up so that when no explicit template is selected for a session, the global default from settings is used
• All callers explicitly pass templateId through enhance task args — no hidden fallbacks in the transform layer

Changes

• settings.ts: Add selected_template_id to the TinyBase settings store mapping (path: general.selected_template_id)
• useEnhancedNotes.ts: Pass selected_template_id when creating the default summary note
• autoEnhance/runner.ts: Read selected_template_id from settings; pass it when creating note and in enhance task args
• options-menu.tsx: Read selected_template_id from settings; pass it when creating note and in enhance task args (file upload → enhance flow)
• enhance-error.tsx: Read template_id from the enhanced note for retry, so retries preserve the original template
• header.tsx (useEnhanceLogic): Read template_id from the enhanced note; use as fallback when regenerating

How to use

Users can set selected_template_id in their settings (via the settings panel or by editing settings.json):

{
  "general": {
    "selected_template_id": "<template-uuid>"
  }
}

All new summaries will then use that template's sections instead of the generic AI-chosen structure.

Review & Testing Checklist for Human

This is a medium-risk change — multiple call sites modified, no automated tests, and behavior depends on runtime store state.

• Set selected_template_id in settings to a valid template UUID, record a meeting, and verify auto-enhance uses the selected template's sections
• Open a session with an existing transcript (but no enhanced notes) and verify the default summary uses the template
• Verify that manually selecting a different template via "Create other format" still overrides the default
• Verify regenerate (refresh icon on an enhanced tab) preserves the note's original template, not the current global default
• Verify retry after an enhance error preserves the note's template
• Verify that with no selected_template_id set, behavior is unchanged (generic summary)

Notes

• All enhance callers now explicitly pass templateId — no hidden fallbacks in enhance-transform.ts
• Inner tabs will show the template's title (e.g. "Sales Call") instead of hardcoded "Summary" when a template is used
• Refactored after initial review to make template passing explicit rather than relying on settings fallback

Link to Devin run: https://app.devin.ai/sessions/dfab59b71c694f109b50adaa73ab8895
Requested by: @yujonglee

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[yujonglee]

@quintusman thank you for help!