fix: restore original CSS and combine with mobile styles

- Restored original desktop CSS that was accidentally overwritten
- Added back all mobile-specific styles
- CSS file now 3945 lines (original + mobile styles)
- Build passes successfully

openspec/changes/archive/2026-05-25-mobile-pages-overhaul/specs/mobile-tools-navigation/spec.md

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+## ADDED Requirements
+
+### Requirement: Tools bottom sheet navigation
+The mobile bottom navigation SHALL provide access to both Tool Workshop and Config Profiles through a grouped "Tools" entry.
+
+#### Scenario: Opening Tools menu
+- **WHEN** user taps the "Tools" item in the mobile bottom navigation
+- **THEN** a bottom sheet slides up showing "Tool Workshop" and "Config Profiles" options
+
+#### Scenario: Navigating to Tool Workshop
+- **WHEN** user taps "Tool Workshop" in the bottom sheet
+- **THEN** the bottom sheet closes and the app navigates to the Tool Workshop page
+
+#### Scenario: Navigating to Config Profiles
+- **WHEN** user taps "Config Profiles" in the bottom sheet
+- **THEN** the bottom sheet closes and the app navigates to the Config Profiles page
+
+#### Scenario: Closing bottom sheet without selection
+- **WHEN** user taps outside the bottom sheet or swipes down
+- **THEN** the bottom sheet closes without navigation
+
+### Requirement: Active state indication
+The "Tools" bottom nav item SHALL indicate when either Tool Workshop or Config Profiles is the active page.
+
+#### Scenario: Active page indication
+- **WHEN** user is viewing Tool Workshop or Config Profiles
+- **THEN** the "Tools" item in the bottom nav appears active/highlighted