fix(folio): stop abusing contentDescription as data carrier (#45)

* feat(hierarchy): full-attribute selector system

- Add Attributes map to Element (raw platform attrs + serialized booleans)
- Add Selector / AttrFilter types for multi-filter AND matching
- Add matchAttr with alias expansion and substring/boolean semantics
- Add matchSelector (AND of all filters)
- id: and desc: keep exact/suffix/prefix semantics for backward compat
- text: widens to substring via matchAttr
- default: case routes unknown kinds to matchAttr (NEW)
- Add Tree.FindNode / Tree.FindAllNodes returning *Node
- Add Node.Find / Node.FindAll for scoped subtree string search
- Add Node.FindBySelector / Node.FindAllBySelector for object AND search
- Add attributeAliases for cross-platform name expansion

* test(hierarchy): full-attribute selector coverage

- raw resource-id: substring match
- label:/content-desc: alias expansion to accessibilityText on iOS
- scrollable:true/false boolean exact match
- title: iOS-only attribute, graceful nil on Android
- text: substring widening
- Selector AND: both filters must match; single miss returns nil
- Node.Find scoped search: descendants only, not siblings

* feat(verifier): object-form selectors + attrs + element-level find

- ax.find/findAll accept string or {attr:value} JS objects
- Object form builds Selector with AND semantics
- Returned element objects expose attrs sub-object (raw platform attrs)
- Returned element objects expose .find() and .findAll() scoped to subtree
- Element-level .find/.findAll accept string or object selectors

* feat(spec): extend AccessibilityElement and AccessibilityTree types

- AccessibilityElement gains attrs, find(), findAll()
- find/findAll on both Tree and Element accept string | AttrSelector
- AttrSelector = Record<string, string> for object-form AND matching

* feat(folio): migrate to chained object-form selectors

- Replace path queries (desc:X > desc:Y) with chained API
- Screen root lookups use { accessibilityText: "ScreenName" }
- Element-scoped searches use find/findAll with string or object
- Keep string selectors for descPrefix: and desc:Back (shows both forms)

* fix(folio): use account_card:id desc, expose balance via text semantics

* fix(folio): embed accountId in LedgerScreen desc, expose values via text semantics

* fix(spec): replace desc-parsing with text-based parseDollarCents extraction

examples/folio/composeApp/src/commonMain/kotlin/app/folio/feature/home/HomeScreen.kt

@@ -123,7 +123,7 @@ private fun AccountCard(
             .clip(RoundedCornerShape(RadiusLg))
             .background(t.surface)
             .border(1.dp, t.border, RoundedCornerShape(RadiusLg))
-            .semantics(mergeDescendants = true) { contentDescription = "account:$id:$balance" }
+            .semantics { contentDescription = "account_card:$id" }
             .clickable(role = Role.Button, onClick = onClick)
             .padding(16.dp),
         verticalAlignment = Alignment.CenterVertically,
@@ -148,6 +148,11 @@ private fun AccountCard(
             )
             Text(txnLabel, style = Type.caption, color = t.textMuted)
         }
-        Text(formatCents(balance), style = Type.bodyStrong, color = t.text)
+        Text(
+            formatCents(balance),
+            style = Type.bodyStrong,
+            color = t.text,
+            modifier = Modifier.semantics { contentDescription = "account_balance" },
+        )
     }
 }

examples/folio/composeApp/src/commonMain/kotlin/app/folio/feature/ledger/LedgerScreen.kt

@@ -75,7 +75,7 @@ fun LedgerScreen(accountId: String) {
     val balance = balanceOf(txns)
 
     Screen(
-        modifier = Modifier.testTag("LedgerScreen").semantics { contentDescription = "LedgerScreen" },
+        modifier = Modifier.testTag("LedgerScreen").semantics { contentDescription = "LedgerScreen:$accountId" },
         header = {
             Header(
                 title = account.name,
@@ -92,11 +92,14 @@ fun LedgerScreen(accountId: String) {
             )
         },
     ) {
-        Box(Modifier.size(1.dp).semantics { contentDescription = "active_account:$accountId" })
-        Box(Modifier.size(1.dp).semantics { contentDescription = "ledger_balance:$balance" })
         Card {
             Text("BALANCE", style = Type.label, color = t.textMuted)
-            Text(formatCents(balance), style = Type.balance, color = t.text)
+            Text(
+                formatCents(balance),
+                style = Type.balance,
+                color = t.text,
+                modifier = Modifier.semantics { contentDescription = "ledger_balance_display" },
+            )
         }
         Text(
             "ACTIVITY",
@@ -138,7 +141,7 @@ private fun TxnRow(id: String, type: TxnType, amount: Long, note: String, date:
         modifier = Modifier
             .fillMaxWidth()
             .padding(vertical = 14.dp)
-            .semantics(mergeDescendants = true) { contentDescription = "ledger_row:$id:$signed" },
+            .semantics { contentDescription = "ledger_row:$id" },
         verticalAlignment = Alignment.CenterVertically,
         horizontalArrangement = Arrangement.spacedBy(12.dp),
     ) {
@@ -166,6 +169,7 @@ private fun TxnRow(id: String, type: TxnType, amount: Long, note: String, date:
             formatCents(signed, signed = true),
             style = Type.bodyStrong,
             color = t.text,
+            modifier = Modifier.semantics { contentDescription = "txn_amount" },
         )
     }
 }