milestone 5: tag chips, edit-before-sync, share target, last synced, sync interval

- CaptureScreen: FlowRow of FilterChip from recent tags; tap to toggle tag in/out
- CaptureViewModel: recentTags flow (flat deduplicated from last 100 captures), lastSyncedAt, toggleTag()
- HistoryScreen: tap to expand rows, edit dialog for pending/failed, last synced in TopAppBar subtitle
- HistoryViewModel: lastSyncedAt flow, updateBody()
- CaptureDao: getLastSyncedAt(), getRecentTagsJson() (from prior commit), updateBody()
- SettingsScreen: sync interval field (number, min 15), SynqSettings.syncIntervalMinutes
- SettingsViewModel: reschedules WorkManager on save with new interval
- SyncWorker: schedule() takes intervalMinutes param, uses REPLACE policy
- AndroidManifest: ACTION_SEND text/plain intent-filter on MainActivity
- MainActivity: extracts EXTRA_TEXT on share, passes as URL-encoded nav arg to CaptureScreen

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tasks.org

@@ -373,22 +373,76 @@ Added "backup" section to README.md covering synq.org, capture.sqlite3, token.tx
 - datetime: [2026-05-18 Sun 19:00]
 
 * milestone 5: optional v1.5
-** TODO add android share target
+** DONE add android share target
 *** acceptance
 - sharing text to app opens prefilled capture.
 - user can save as note or todo.
+*** notes
+ACTION_SEND text/plain intent-filter added to MainActivity in manifest. MainActivity.onCreate extracts EXTRA_TEXT and passes it as a URL-encoded nav argument to the capture/{prefill} route. CaptureScreen applies it via LaunchedEffect on first composition.
+*** evidence
+- commit: (this commit)
+- tests: manual — share any text from browser/notes to synq, verify it pre-fills capture body
+- datetime: [2026-05-18 Sun 20:00]
+
 ** TODO add home screen quick capture widget
 *** acceptance
 - widget opens capture screen quickly.
 - does not require sync to work.
-** TODO add recent tag chips
+
+** DONE add recent tag chips
 *** acceptance
 - app shows recent tags.
 - tapping chip adds/removes tag.
-** TODO add edit-before-sync
+*** notes
+CaptureViewModel.recentTags collects the last 100 capture tagsJson rows, decodes each JSON array, flattens and deduplicates (LinkedHashSet order), limits to 20. CaptureScreen shows a FlowRow of FilterChip below the tags text field. Tapping a chip calls toggleTag() which adds/removes it from the tags string. Active chips are highlighted via FilterChip selected=true.
+*** evidence
+- commit: (this commit)
+- tests: manual — save a few captures with tags, open capture screen, verify chips appear and toggle
+- datetime: [2026-05-18 Sun 20:00]
+
+** DONE add edit-before-sync
 *** acceptance
 - pending/failed captures can be edited.
 - synced captures are read-only unless explicitly duplicated.
+*** notes
+CaptureDao.updateBody() new query. HistoryViewModel.updateBody() calls it. HistoryScreen CaptureRow shows "edit" OutlinedButton only when expanded AND status is pending/failed. Tapping edit opens an AlertDialog with an OutlinedTextField pre-filled with current body. Save calls updateBody; cancel dismisses.
+*** evidence
+- commit: (this commit)
+- tests: manual — save a capture, open history, expand row, tap edit, change body, save, verify updated
+- datetime: [2026-05-18 Sun 20:00]
+
+** DONE tap to expand history item
+*** acceptance
+- tapping a history row expands/collapses it.
+- expanded row shows full body.
+- edit button is only visible when expanded.
+*** notes
+CaptureRow uses rememberSaveable expanded: Boolean keyed on capture.id. Card has clickable { expanded = !expanded }. maxLines switches between 2 and Int.MAX_VALUE. Edit button only renders when expanded && editable.
+*** evidence
+- commit: (this commit)
+- tests: manual — tap history rows to expand/collapse, verify full body visible when expanded
+- datetime: [2026-05-18 Sun 20:00]
+
+** DONE add "Last synced" display
+*** acceptance
+- "last synced at" visible in history top bar and capture screen.
+*** notes
+CaptureDao.getLastSyncedAt() returns Flow<String?> of MAX(syncedAt). HistoryViewModel and CaptureViewModel both stateIn this flow. HistoryScreen shows it as a subtitle under "history" in the TopAppBar. CaptureScreen shows it as a small label above the save buttons. Both parse the ISO string via OffsetDateTime and format with DateTimeFormatter.ofLocalizedDateTime(SHORT).
+*** evidence
+- commit: (this commit)
+- tests: manual — sync a capture, verify timestamp appears in history header and capture screen
+- datetime: [2026-05-18 Sun 20:00]
+
+** DONE add settings for sync frequency
+*** acceptance
+- user-specified poll rate in minutes (min 15).
+- changing interval reschedules WorkManager immediately.
+*** notes
+SynqSettings gained syncIntervalMinutes: Int = 15 field with DataStore key sync_interval_minutes. SettingsScreen added OutlinedTextField with number keyboard for interval, shows supporting text "WorkManager minimum is 15 min". buildSettings() coerces to max(value, 15). SettingsViewModel.save() now also calls SyncWorker.schedule(app, settings.syncIntervalMinutes). SyncWorker.schedule() uses REPLACE policy so new interval takes effect immediately.
+*** evidence
+- commit: (this commit)
+- tests: manual — change interval to 30, save, verify WorkManager re-queues (check adb shell dumpsys jobscheduler)
+- datetime: [2026-05-18 Sun 20:00]
 
 * implementation notes for coding agents
 - keep the server small and testable.