Deep Search: Filter Tree by Page Content

[mrpilot2]

Parent PRD

#73

What to build

Extend the SettingsPage interface with a matches(QString) method. Implement a default search that iterates through the page's child widgets (Labels, CheckBoxes, etc.). Update the proxy model to include pages where the content matches the search pattern.

Acceptance criteria

• Tree view filters based on content within settings pages (e.g. checkbox labels)
• SettingsPage interface has matches method
• Default implementation of matches handles common widget types

Blocked by

• Blocked by Core Filtering: Filter Tree by Page Names #75

User stories addressed

• User story 2