refactor(ui): unify settings experience and optimize interactions

- Replace UnifiedProviderPickerView with SimpleProviderPicker in Codex and Claude settings
- Remove model override editors from Codex (use catalog defaults)
- Simplify Claude model mapping sheet with provider context
- Migrate remaining icon views to use unified theme helper
- Update menu bar provider selection to use simplified two-option picker
- Fix spacing in settings Grid layouts (12pt -> 4pt vertical)
- Update AGENTS.md with provider icon theme handling guidelines
- Improve consistency across all settings pages and UI components

fix(ui): improve session list item spacing and text truncation

- Add text truncation (.tail) to session titles to prevent overflow
- Add right padding (32pt) to prevent title/icon overlap
- Add 8pt left padding to right-side icons for consistent spacing
- Ensures proper visual separation between title text and trailing icons

feat(makefile): add zip target for creating zip archives from DMG files

- Introduce a new 'zip' target to create zip archives from generated DMG files.
- Implement error handling for missing version and output directory.
- Ensure DMG files exist before attempting to create zip archives.
- Provide feedback during the zip creation process.

feat: add provider icons and system icons to menus, improve UI consis…

…tency

- Add provider asset icons (ChatGPT/Claude/Gemini) to menu items in ProjectsListView
- Add system icons (terminal, network) to menu submenus
- Fix sticky header interaction in ConversationTimelineView (move gesture handlers to inner content)
- Improve menu item consistency with assetImage parameter support

docs: add comprehensive feature inventory documentation

What:
- Introduced a new `feature-inventory.md` file detailing the features of CodMate.
- Organized features into categories with corresponding code evidence for traceability.
- Included sections on coverage methodology, value/advantage mapping, and use case scenarios.

Why:
- Provides a structured reference for developers and stakeholders to understand the capabilities of CodMate.
- Facilitates future feature synthesis and marketing efforts by mapping features to user value.

Where:
- Added `docs/feature-inventory.md`: Comprehensive documentation of features and their implementations.

feat: improve UX with notification URL handling and Codex config sync

What:
- Suppress window activation when handling codmate://notify URLs
- Add 1-second delay before resetting activation suppression flag
- Read sandbox_mode and approval_policy defaults from ~/.codex/config.toml
- Prefer Codex CLI config values over CodMate preferences when available
- Implement simple TOML parser for top-level key-value pairs
- Improve code formatting in UsageProviderSnapshot

Why:
- Notification URLs should not interrupt user workflow by activating windows
- Codex CLI config should be source of truth for sandbox/approval defaults
- Keeping CodMate in sync with Codex settings reduces configuration confusion
- Simple TOML parsing avoids external dependencies for basic config reading

Where:
- CodMateApp.swift: Notification URL activation suppression logic
- services/SessionPreferencesStore.swift: Codex config.toml reading and preference sync
- models/UsageProviderSnapshot.swift: Code formatting improvements

fix: resolve loading state race condition and remove unsafe force unwrap

What:
- Fix loading state binding race condition in ProjectOverviewViewModel
- Set hasLoadedOnce early in scheduleSnapshotRefresh to enable proper state sync
- Remove force unwrap on Calendar.date(byAdding:to:) in AutoAssignSheet
- Add defensive fallback when calendar operation fails

Why:
- Previous logic kept isLoading=true during initial load even when parent finished loading
- hasLoadedOnce was only set after snapshot completion, preventing state synchronization
- Force unwrapping calendar operations is unsafe, though edge cases are rare
- Graceful degradation improves robustness

Where:
- models/ProjectOverviewViewModel.swift: Loading state synchronization logic
- views/AutoAssignSheet.swift: Calendar operation error handling

chaos: add notices generation and update documentation

Changes:
- Introduced a new `make notices` command to regenerate `THIRD-PARTY-NOTICES.md` from resolved dependencies.
- Added a Python script (`gen-third-party-notices.py`) to automate the generation of the notices file.
- Updated `Makefile` to include the new `notices` target.
- Enhanced `README.md` and `BUILD.md` to document the new notices generation process and its purpose.
- Improved the structure and content of `THIRD-PARTY-NOTICES.md` to include detailed license information for dependencies.