Summary

Fixes #1317 — typing #tag, ##tag, or even ###tag could save a double‑hash tag to the database, breaking search.
We now trim whitespace and strip every leading # on every tag‑creation path:

• standalone Tags screen (tags.create, tags.update)
• bookmark editor (bookmarks.updateTags)

UI continues to display #tag; only storage is normalized.

Key changes

packages/trpc/utils/tag.ts: new normalizeTagName helper
packages/trpc/routers/tags.ts: call helper in create and conditional update
packages/trpc/routers/bookmarks.ts: apply helper (bulk) + ignore empty names to avoid values() must be called with at least one value error
packages/trpc/routers/tags.test.ts: +2 tests (create & update) confirming hashes are stripped

Tests

pnpx vitest run packages/trpc

• All existing suites pass.
• New cases:
  • ##demo → stored demo (create)
  • rename #foo→##bar → stored bar (update)