Add backfilled and year-mode changesets

- Backfill missing minor changeset for prior AI transforms (d53b16c)
- Add minor changeset for spoken year conversion mode
- Restore original number-word changeset summary for PR kitlangton#155 context

Author: alasano

.changeset/backfill-ai-transforms.md

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+---
+"hex-app": minor
+---
+
+Backfill: add AI transcript transforms in settings and transcription flow (commit d53b16c)

.changeset/d3bf0f57.md

@@ -2,4 +2,4 @@
 "hex-app": minor
 ---
 
-Add options to convert spoken number words and years to digits (#155)
+Add option to convert spoken number words to digits (ported from upstream PR #155)

.changeset/spoken-years-to-digits.md

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+---
+"hex-app": minor
+---
+
+Add optional spoken year conversion toggle (e.g. "twenty twenty one" → "2021") plus conservative parsing safeguards