feat(ios): add on-device dictation widget

[humandebri]

Purpose

• Add foreground-only, on-device dictation capture launched from WidgetKit, Siri, and Shortcuts.
• Preserve reviewed transcript drafts locally until the user explicitly saves them to Kinic.

Changes

• Add the voice Widget, App Intent, universal-link routing, Quick Capture UI, draft store, and Settings management.
• Require on-device speech recognition and keep audio out of local storage and VFS payloads.
• Ignore duplicate launch requests while recording without resetting the active engine, timer, transcript, or draft.
• Stop safely on audio-session interruption, preserving non-empty partial transcripts while avoiding empty drafts and duplicate completion.

Verification

• XcodeGen project generation succeeded.
• Swift 6 simulator test suite passed: 320 tests across 27 suites.
• Duplicate launch, partial and empty interruption, observer cleanup, and duplicate notification regressions are covered.
• git diff --check and repository branch/commit validation passed.

Impact

• Adds iOS Widget, Siri, and Shortcuts entry points for dictation notes.
• Does not change backend, VFS, schema, or Markdown metadata contracts.
• Physical-device interaction checks for permissions, Widget families, Siri phrasing, and call/Siri interruptions remain manual follow-up.