TP-21 — Wire ThemePickerButton into Preferences

[ZhuchkaTriplesix]

Epic: C
Depends on: TP-17, TP-18

Source: docs/theme-parser-github-issues.md

Goal

Replace or extend current Color preset dropdown with registry-backed theme selection.

Files

• lib/features/settings/preferences_appearance_section.dart
• lib/features/settings/theme_picker_button.dart

Implementation

In Appearance:

• keep Theme mode;
• replace Color preset row with Theme row using ThemePickerButton;
• include existing Querya Dark/Light as built-in definitions;
• show current imported/registry selected theme;
• call ThemeController.setThemeById(id) on select;
• keep old Import theme… and Reset appearance buttons.

Compatibility

• If registry unavailable/empty, fallback to current preset dropdown behavior or show Querya Dark/Light only.

Acceptance Criteria

• Querya Dark/Light selectable.
• Legacy imported theme selectable if present.
• Selecting registry theme applies immediately.
• Existing reset returns to Querya Dark.

Tests

• widget shows built-in themes;
• selecting theme calls controller hook or fake callback;
• reset remains visible;
• import button remains visible.

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