Mirrors NativeAppTemplate-Android PR #39 (which itself mirrors iOS PR #50).
After this, the app is a generic CRUD shell with Shops and Settings tabs;
ItemTagDetailView is a placeholder (name, description, state, completedAt).

### Deletions
- NfcError; ItemTagWriteView/VM + test
- ui/scan/* (ScanView, ScanViewModel, DoScanView, DoScanViewModel,
  CompleteScanResultView, ShowTagInfoScanResultView, ScanNavigation)
  + DoScanViewModelTest
- Models: CompleteScanResult, CompleteScanResultType, ShowTagInfoScanResult,
  ShowTagInfoScanResultType, ItemTagInfoFromNdefMessage, ItemTagType,
  ScanState, ItemTagData
- Proto schemas: scan_result.proto, item_tag_data.proto,
  item_tag_info_from_ndef_message.proto
- res/raw/nfc_reader.json

### Strip / rewrite
- MainActivity: dropped NFC imports, onNewIntent, ACTION_NDEF_DISCOVERED
  handling, singleTask launch mode
- MainActivityViewModel: rewritten minimal (logout + permissions refresh +
  didShowTapShopBelowTip)
- NatAppState / NatNavHost / TopLevelDestination: dropped SCAN_TAB,
  shouldNavigateToScanView flow, navigateToScan helper, scan nav graph
- ShopDetailView / VM: dropped queue instructions block, ReadInstructionsTip,
  didShowReadInstructionsTip; renamed resetItemTag -> idleItemTag and swipe
  action "Reset" -> "Idle" (width 64dp -> 96dp)
- ShopSettingsView / VM: removed the "Reset Number Tags" section, resetShop
  flow
- ItemTagDetailView / VM: placeholder (name, description, state, completedAt)
- LoginRepository (+ Impl) / NatPreferencesDataSource: dropped scan-related
  setters/getters, didShowReadInstructionsTip
- ShopRepository / ShopApi / Impl: dropped resetShop
- ItemTagApi / Repository / Impl: renamed resetItemTag (/reset) ->
  idleItemTag (/idle)
- Utility: dropped scanUri(), extractItemTagInfoFrom(), NFC imports
- NatConstants: dropped SCAN_PATH, SCAN_PATH_CUSTOMER
- UserData: dropped didShowReadInstructionsTip,
  scanViewSelectedTabIndex, shouldFetchItemTagForShowTagInfoScan,
  shouldCompleteItemTagForCompleteScan
- shopSettingsNavigation: dropped ItemTagWriteRoute / itemTagWriteView
- Demo / test repos updated to match trimmed interfaces; obsolete tests
  removed (UtilityTest scanUri, CodedErrorTest NfcError, ItemTagDetailVMTest
  isLock, ShopDetailVMTest reset/didShowReadInstructionsTip)

### Config
- AndroidManifest.xml: removed NFC permission, android.hardware.nfc feature,
  NDEF_DISCOVERED intent-filter, singleTask launch mode
- build.gradle.kts / libs.versions.toml: removed compose-qr-code, capturable,
  lottie-compose
- user_preferences.proto: removed scan fields
- strings.xml: removed ~25 scan/NFC/QR strings; onboarding descriptions 1-13
  rewritten to generic "Welcome to the app." placeholder so OnboardingView
  still compiles (worth redesigning or deleting in a follow-up)

### Test plan
- [x] ./gradlew assembleDebug passes
- [x] ./gradlew test passes
- [x] ./gradlew spotlessCheck passes
- [x] ./gradlew lint passes
- [x] ./gradlew buildHealth passes
- [ ] Manual smoke test on device/emulator: 2 tabs visible (Shops /
  Settings), no Scan tab; sign-in works; ItemTag create / view detail
  placeholder / edit / delete flows work

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Mirrors NativeAppTemplate-Android PR #40 (which mirrors iOS PR #50).
After this sub-phase, ItemTag is a generic parent-child CRUD UI:
Create/Edit accept any unicode/symbol name with multi-line description,
Detail screen shows a state badge + completed timestamp + Mark-as-completed/idled toggle,
the list card surfaces description preview + state.

Differences from the paid PR: this Free repo has no per-action permission
system (canCreateShops / canUpdateShops / canDeleteShops / canManageTags),
so all permission-gating in views and ViewModels is omitted — the FAB,
swipe-delete, edit toolbar, and state-toggle button are always shown.

### Data layer
- ItemTag.position: Int? -> Int = 0. Rails server's set_position_if_missing
  always populates this; client trusts the contract.
- ItemTagBodyDetail: dropped position (server auto-assigns).
- Data.getPosition() / ItemTag.getPosition(): now non-null Int.

### Rename maximumQueueNumberLength -> maximumNameLength
- Meta serial name maximum_queue_number_length -> maximum_name_length;
  default fallback 256 -> 100.
- Threaded through Permissions, UserData, user_preferences.proto,
  NatPreferencesDataSource, LoginRepository(+Impl), TestLoginRepository,
  DemoLoginRepository.

### ItemTag Create + Edit
- Validation relaxed: drop alphanumeric and count >= 2 checks. Valid name
  is 1 - maximumNameLength chars (any unicode/symbols/spaces).
- New description field: 0 - 1000 chars, optional, multi-line
  OutlinedTextField (minLines = 4).
  NatConstants.MAXIMUM_ITEM_TAG_DESCRIPTION_LENGTH = 1_000.
- Standard keyboard (no .Ascii).
- hasInvalidData checks both name AND description; Edit's also requires
  that name OR description changed.

### ItemTag Detail full rewrite
- HeaderRow: name + IdlingTag() / CompletedTag() badge.
- DescriptionSection: hidden when blank.
- CompletedAtRow: shown only when state == Completed.
- StateToggleButton: flips between Mark as completed and Mark as idled;
  uses MainButtonView; disabled while isToggling.
- ViewModel: new isToggling, completeItemTag(), idleItemTag(). Errors
  set uiState.message; success silently updates itemTag (matches the
  no-success-toast pattern from #31).

### ItemTag list card
- Headline: name + state badge.
- Supporting: description preview (2 lines, ellipsis) + completed
  timestamp when state == Completed.

### Date helpers
- Add ZonedDateTime.cardDateTimeString() and String.cardDateTimeString()
  to DateUtility.
- Card date format MMM dd yyyy -> yyyy/MM/dd.
- ShopDetailCardView and ItemTagListCardView use cardDateTimeString().

### Strings + constants
- New: name_label, description_label, completed_at_label,
  item_tag_name_placeholder, item_tag_name_is_invalid,
  item_tag_description_is_invalid, item_tag_name_help (format),
  item_tag_description_help (format), mark_as_completed, mark_as_idled.
- Removed queue-specific: tag_number, tag_number_is_invalid, zero_padding.

### Tests
- ItemTagCreateViewModelTest: new validation matrix (unicode/symbols,
  100/101 boundary, 1000/1001 description boundary).
- ItemTagEditViewModelTest: rewritten - unchanged-form invalid,
  description-only change valid, blank name invalid, unicode/symbols valid.
- ItemTagDetailViewModelTest: + completeItemTag / idleItemTag success cases.
- DateUtilityTest: + cardDateTimeString tests.

### Test plan
- [x] ./gradlew clean assembleDebug passes
- [x] ./gradlew test passes
- [x] ./gradlew spotlessCheck passes
- [x] ./gradlew lint passes
- [x] ./gradlew buildHealth passes
- [ ] Manual smoke test on emulator: sign in, create tag with
  "Buy milk 🥛" and multi-line description; mark complete; mark idled;
  edit description; delete

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

The test takes a long time to run, so I've commented it out.

spotlessCheck and Android Lint remain active.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Flip SwipeableItemWithActions so users drag the row right-to-left to
reveal action buttons, with the buttons sitting on the trailing (right)
edge instead of the leading (left) edge. Matches the iOS app's
swipeActions(edge: .trailing) and the platform-conventional
swipe-to-reveal gesture.

- Actions Row aligned to Alignment.CenterEnd of the wrapping Box
- Drag offset coerced to [-contextMenuWidth, 0f]
- Revealed anchor flipped to -contextMenuWidth; half-way fling threshold
  checks <= -contextMenuWidth / 2f

Public API (isRevealed, actions, onExpanded, onCollapsed, content,
modifier) is unchanged, so both call sites pick up the new direction
with no edits:
- ShopDetailView — Complete / Idle actions on item-tag rows
- ItemTagListView — Delete action on item-tag rows

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Two unrelated substrate-v2 cleanups bundled here.

## 1. Drop maximum_name_length from permissions; move to NatConstants

The server no longer sends maximum_name_length in /shopkeeper/permissions;
the client already tolerated its absence via a default. Promote the value
to a constant and drop the dead plumbing.

### Stop reading maximum_name_length from /shopkeeper/permissions
- Meta: drop the @SerialName("maximum_name_length") field.
- Permissions: drop getMaximumNameLength() helper.
- UserData: drop maximumNameLength field.
- user_preferences.proto: reserved 23 (was maximum_name_length) so the
  wire number isn't reused.
- NatPreferencesDataSource: drop the read in the userData mapping, the
  write in setPermissions, and the getMaximumNameLength() flow.
- LoginRepository (interface + impl + DemoLoginRepository +
  TestLoginRepository): drop getMaximumNameLength().

### Move maximumNameLength to NatConstants
- NatConstants: add MAXIMUM_ITEM_TAG_NAME_LENGTH = 100.
- ItemTagCreateViewModel + ItemTagEditViewModel:
  - UiState.maximumNameLength default now reads the constant.
  - Drop the loginRepository constructor param — it was only used for
    getMaximumNameLength().
  - ItemTagCreateViewModel.reload() simplifies to a state reset.
  - ItemTagEditViewModel.fetchData() drops the combine() pairing the
    item-tag flow with the maximum-name-length flow.
- Tests rewritten to drop the now-removed loginRepository wiring and
  the dead .copy(maximumNameLength = 100) calls; new
  maximumNameLength_matchesConstant tests assert against the
  NatConstants value (100).

## 2. Remove "How To Use" entry from Settings

Drop the SettingsView list item linking to myturntag.com/how — a
queue-product help page that no longer matches the substrate-v2
generic CRUD app surface.

The string resource (R.string.how_to_use), the
NatConstants.HOW_TO_USE_URL constant, and the OnboardingView call site
are left in place because they are still wired and may be repurposed.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Mirror the ItemTag pattern (PR #35) for Shop. Server has no caps on Shop
name/description; this is a client-only UX guard.

### Changes
- NatConstants: MAXIMUM_SHOP_NAME_LENGTH = 100,
  MAXIMUM_SHOP_DESCRIPTION_LENGTH = 1_000.
- strings.xml: new shop_name_is_invalid, shop_description_is_invalid,
  shop_name_help, shop_description_help (parametric).
- ShopCreateViewModel + ShopBasicSettingsViewModel:
  - UiState gains maximumNameLength / maximumDescriptionLength
    (defaulted to the constants).
  - hasInvalidData() splits into hasInvalidDataName() +
    hasInvalidDataDescription(); the parent now ORs both.
  - updateName() / updateDescription() reject input over the cap
    (mirrors the existing ItemTagCreateViewModel /
    ItemTagEditViewModel Android pattern).
- ShopCreateView + ShopBasicSettingsView: switch supportingText to the
  two-line layout (always-visible help + conditional red "is invalid"
  line), matching ItemTagCreateView / ItemTagEditView. Description
  switches to heightIn(min=120) + minLines=4.
- Tests: maximumNameLength_matchesConstant /
  maximumDescriptionLength_matchesConstant, boundary tests at
  100 / 101 / 1000 / 1001 chars on both ShopCreateViewModelTest and
  ShopBasicSettingsViewModelTest.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* ShopDetailCardView: 2-column layout with description

Mirror iOS ItemTagListCardView's 2-column HStack pattern in
ShopDetailCardView so each item-tag row in ShopDetailView surfaces the
description alongside the name.

Layout:
- Left column (weight 1): name (titleLarge), description (bodySmall,
  max 2 lines, ellipsis) hidden when blank.
- Right column (minWidth 82dp, end-aligned): state tag — CompletedTag +
  completedAt for Completed; IdlingTag for Idled.

Matches iOS ItemTagListCardView's HStack { VStack(alignment: .leading)
[name, description] | Spacer | VStack(alignment: .trailing) [tag,
completedAt] } shape.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* Move description from ShopDetailCardView to ItemTagListCardView

Drop description block from ShopDetailCardView and revert to the
flatter row layout. Restructure ItemTagListCardView from ListItem to
a manual Row with a 2-column layout that surfaces the description.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

)

Port iOS NativeAppTemplate-iOS#61 to Android:
- Drop `scannedItemTagsCount` from Attributes/Data and remove the
  "tags scanned by customers" stat from ShopListCardView.
- Add a left-aligned shop_detail_instruction header to ShopDetailView
  ("Swipe an item tag to change its status.").
- Swap OnboardingView's How-To-Use link for the Support Website link
  and trim onboarding from 13 to 8 descriptions; update placeholder
  strings to match the iOS copy.
- Normalize ItemTag labels: label_add_tag/add_tag_description/
  label_edit_item_tag/title_delete_item_tag and message_item_tag_*
  values now read "Item Tag" / "Item tag" consistently.
- Drop unused HOW_TO_USE_URL, R.string.how_to_use, R.string.learn_more.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>