feature: live component search in the demo app navigation drawer

[sohankshirsagar]

Summary

The demo drawer lists 17 components with no way to jump to one; this adds a ZdsSearchView header that filters the drawer menu as you type, so the ZDS catalog is browsable by name.

NavigationSearch.attach(navView) inflates a second header (the existing navigation_header stays at index 0, so getHeaderView(0) in MainActivity is unaffected) and drives the existing navigation_drawer menu directly — no new menu model:

onQueryTextChange(q)  -> item.setVisible(title.contains(q)); submenu hidden when 0 children match
                         empty-state TextView shown when nothing matches
onQueryTextSubmit(q)  -> if exactly one leaf is visible, performIdentifierAction() (enter jumps straight to it)
onNavigationItemSelected -> mNavigationSearch.reset()  // clear query + restore all items

Two non-obvious details:

• syncActionView() hides an item's badge action view while the item is filtered out. Without it, NavigationView's recycler re-attaches the "24" badge from the hidden Buttons row onto whatever row lands in that position.
• Footer spacer items are skipped by the filter so drawer spacing is unchanged.

Also renames ic_currency_north_america_$_{round,sharp}.xml (unreferenced, added by an automated deps commit) to ..._usd_...: AAPT rejects $ in resource filenames, which fails assembleDebug on main today.

Screenshots

Drawer with the search field, filtered results, and the empty state:

Devin-Org: engineering

Link to Devin session: https://app.devin.ai/sessions/a3b2a208d83f4550abcbbc2bfab5ae0a
Open in Devin Desktop: https://app.devin.ai/desktop/session/a3b2a208d83f4550abcbbc2bfab5ae0a?variant=devin
Requested by: @sohankshirsagar

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[devin-ai-integration]

Verified on an Android emulator (API level of the devin AVD, 1080x2400), including rechecks of the two fixes made during testing (multi-match submit, dark empty state).

Drawer search verification

• Passed: live filtering across the Buttons submenu and top-level items, case-insensitive.
• Passed: buttons → 3 results, Enter stays in the drawer; snack → 1 result, Enter opens Snackbar.
• Passed: selecting an item navigates, clears the query, and restores the full menu.
• Passed: the 24 badge stays on Buttons and never lands on a filtered-in row.
• Passed: dark-mode empty state readable after dc94c7d.

Multiple results: Enter does not navigate	Dark empty-state fix

Limitations and pre-existing finding

One local emulator only; no physical device or alternate screen sizes. The ZdsSearchView query hint is still dim in dark mode — Zds.SearchView sets android:textColorHint=@color/zebra_hint and values-night/colors.xml has no zebra_hint override, so it affects the existing Search demo screen too. Left out of this PR.

Devin session