Analysis Catalog: phrase rows

Add phrase analyses to the Analysis Catalog (#186) as their own list.

Blocked by #187 (dedupe phrase payloads on write). Until phrase payloads are deduped, a phrase row would be a read-time grouping over N identical records rather than a real row: counts would have to be computed by grouping on content, editing would be an N-way fan-out write, and delete would mean "remove N payloads and N links". Doing that first and unpicking it later is strictly worse than waiting — after #187 a phrase row is a record with links, exactly like a token row, and everything the catalog already does applies unchanged.

Scope once unblocked

• A second list (the panel gains tabs at this point: Tokens / Phrases, each trigger showing its count).
• One row per distinct PhraseAnalysis: surface form, gloss, usage count, usage locations from phraseAnalysisLinks[].tokens[].tokenRef.
• Search over surface form + gloss using the same search fold as token rows.
• Sort and filters reuse the token implementations; the facet-derivation rule (hide any facet with fewer than two distinct values) applies unchanged.
• Edit, merge, and delete are analysis-keyed and global, matching the token mutations.

Delete semantics

Deleting a phrase analysis dissolves the grouping — the member tokens stop being a phrase and revert to individual tokens. This is consistent with the principle that delete removes recorded analysis and never changes the text or its segmentation: the token sequence is untouched, only the phrase-level analysis goes. Worth confirming this reads correctly to users, since the visible effect is an arc disappearing.

Why phrases are unreachable until this ships

A phrase gloss lives in no token analysis, so nothing in a token-only catalog surfaces it. This is the real cost of the token-only v1 and the reason this issue exists rather than being folded into #186.

Blocked by: #187. Follow-up to #186.

Start by resolving or reviewing blocker #187, then inspect the existing token-row Analysis Catalog implementation and its search, sorting, filtering, and mutation paths. Add the Tokens/Phrases tabs and phrase rows using the stated surface, gloss, count, and usage-location behavior. Done means phrase analyses are searchable, editable, mergeable, deletable, and deletion dissolves phrase grouping without changing token text or segmentation.