docs: update technical documentation based on recent code changes

[devin-ai-integration]

docs: update technical documentation based on recent code changes

Summary

Updates five documentation files to reflect features and changes introduced in the last 7 days across multiple PRs:

• Keyboard Shortcuts (faq/6.keyboard-shortcuts.mdx): Updated ⌘+Q entry to reflect the new hold-to-quit overlay behavior from Replace Cmd+Q hide behavior with hold-to-quit overlay #3696. Tap shows an overlay; holding for 1.5s confirms quit.
• Features FAQ (faq/1.features.mdx): Added three new entries:
  • Backlink mentions (@ to link notes/people/companies) from feat: implement backlink mentions for notes, people, and companies #3627
  • Advanced Search tab (⌘⇧F with type/date filters) from add advanced search tab and state management #3555
  • Unignore calendar events via context menu from feat: add context menu to unignore events #3672
• Analytics (developers/12.analytics.mdx): Added onboarding_step_viewed event with step, platform, skip_login properties from commit d5d46f4.
• Settings (faq/7.settings.mdx): Added In-Meeting Reminder lab setting (MicProlongedUsage detection) from feat: add MicProlongedUsage detection event #3681.
• Local LLM Setup (faq/9.local-llm-setup.mdx): Added Tool Calling Fallback section noting that models without tool call support (e.g., Gemma) now work via automatic text-based fallback, from feat: add fallback for models without tool calling support #3608.

Review & Testing Checklist for Human

• Verify hold-to-quit timing: The docs state "1.5 seconds" — confirm this matches the actual quitTimer duration in crates/intercept/swift-lib/src/lib.swift. Also verify that "Show quit overlay" accurately describes the tap behavior.
• Verify In-Meeting Reminder description: Docs say "several minutes" — check the actual MIC_ACTIVE_THRESHOLD constant in plugins/detect/src/mic_usage_tracker.rs and consider whether a specific duration should be stated.
• Render check: Build the web app or view the Netlify preview to confirm the MDX renders correctly (tables, <kbd> tags, headings).

Notes

• Changes are docs-only and were formatted with dprint fmt. No code changes.
• Internal/architecture changes (git plugin, Nango crate, api-auth/api-sync/api-subscription extraction, apps/control removal) were intentionally excluded since they are not user-facing.
• Requested by: unknown ()
• Link to Devin run

[devin-ai-integration]

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