feat(mobile): close guest Home, Search, and Categories

[TheDarkSkyXD]

Closes #148
Closes #149
Closes #150

Guest Home, Search, and Categories already shipped. These issues stayed open because Category Detail clips could not sort by recency, coverage tabs stayed missing, and D07 lacked named catalog keys.

Product

• Clip sort is Views or Recent. Helix Get Clips has no sort param, so recency sorts the fetched page in composeCategoryDetail.
• Contract prose now matches the assigned channel-follow control id.
• Coverage matrix marks Search, Category Detail, Channel, and Following tabs implemented.

Evidence

• Parity records: home-live-discovery.md and category-discovery.md.
• Catalog: D07 now has change-gate and api30-journey plus the existing d07-guest-categories row.
• Residuals stay residual. Live catalog success, tablet layout, TalkBack, typed Search history, and a device clip Recent tap were not invented.

Verification

• 19 discovery Vitest files, 75 tests
• node docs/research/streamfusion-mobile/coverage-matrix-check.mjs (implemented 49)
• node scripts/verify-evidence.mjs --resume (33 verified)
• Desktop pre-commit smoke healthy: true

OAuth stays on #145 and #146.

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