feat(frontend): let the clinician pick the tooth from the candidates

An under-specified tooth was a dead end: the sheet said what was missing
and the clinician had to leave and hunt for it on the chart. The readings
are enumerable, so the review sheet now renders them as chips — the one
interactive part of an otherwise read-only confirmation step.

A pick is folded into the result by withChosenTeeth() rather than tracked
alongside it, so the rows, the mini chart, the prosthesis warning and
applyVoiceResult all keep reading a single VoiceExtractionResult and none
of them has to know the chips exist. It unions rather than toggles: a
candidate can coincidentally be a tooth the recording already produced, and
tapping it must not deselect that one.

Two things that would otherwise make the chips look functional while
applying nothing: the teeth row is ticked on the first pick (it starts
unticked when the recording produced no teeth of its own), and the apply
count is now intersected with row availability so it cannot promise to
apply a row with nothing in it.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

frontend/messages/en.json

@@ -909,12 +909,13 @@
     "voiceProsthesisIncomplete": "No prosthesis type for {teeth} — the case cannot be sent until every tooth has one.",
     "voiceLabInexact": "The spoken name only partly matched this lab. Confirm before sending.",
     "voiceNotUnderstood": "Not understood",
+    "voicePickTooth": "Which tooth?",
     "voiceDiscard": "Discard",
     "voiceApply": "{count, plural, one {Apply # field} other {Apply # fields}}",
     "voiceUnresolved": {
       "not_permanent_tooth": "not a permanent tooth",
       "position_out_of_range": "not a valid tooth position",
-      "tooth_missing_quadrant": "quadrant not said — e.g. “upper right two”",
+      "tooth_missing_quadrant": "not a whole tooth number — say e.g. “twenty-six”",
       "malformed": "could not be read",
       "span_not_same_arch": "a bridge cannot span both jaws",
       "unknown_catalog_code": "not in this clinic’s list",