Match Add Task/Chore widget icons and colours to the rest of the app

[mapgie]

Summary

• Both quick-add widgets previously showed just a "+" on a generic GlanceTheme.colors.primary/.tertiary background (an arbitrary choice made when the widgets were first built). They now match the rest of the app:
  • Add Task: Icons.Filled.CheckCircle icon + TypeTaskContainer/TypeTaskOnContainer colours — the exact same icon and fixed accent colour already used for Tasks on the bottom nav and add-menu FAB (DashNavGraph.kt, AddMenuFab.kt).
  • Add Chore: Icons.Filled.CleaningServices icon + TypeChoreContainer/TypeChoreOnContainer colours, likewise matching Chores elsewhere.
  • These TypeTaskContainer/TypeChoreContainer colours are intentionally fixed across all four user-selectable colour themes (per the comment in Color.kt), so the widgets keep a stable identity no matter which palette is active — this is a stronger match than reusing the theme-dependent primary/tertiary roles the widgets used before.
• Since Compose ImageVector icons can't be passed directly to Glance's Image, added two vector drawables (ic_widget_task.xml, ic_widget_chore.xml) built from Google's authoritative Material Symbols path data for check_circle and cleaning_services (fetched directly from google/material-design-icons rather than transcribed from memory, then cross-checked for well-formed XML and valid path-command syntax). They use a <group android:translateY="960"> wrapper to shift Material Symbols' "0 -960 960 960" viewBox convention into Android's vector coordinate space, rather than hand-editing every coordinate.
• The existing shape distinction (rounded square vs. pill) and tap-to-open behavior are unchanged — this is purely an icon/colour swap.
• Adds a changelog/unreleased/ fragment (patch bump).

Test plan

• Place both widgets on a home screen and confirm the Task widget shows a checkmark-circle icon on a blue/indigo background, and the Chore widget shows a cleaning icon on a teal-green background, matching the bottom nav / add-menu FAB colours.
• Resize both up to 2x1 and confirm the icon + "Add task"/"Add chore" label render without clipping.
• Switch the in-app colour theme (Settings > Personalisation) and confirm the widget colours stay the same (since they're fixed, not palette-dependent).
• CI build/lint/changelog checks pass.

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