Rebase the bot-generated 7.78.0 changelog onto the latest
release/7.78.0 (which now includes the [7.77.1] section from
#30397) and clean per release-changelog-guideline:

- Drop the "### Uncategorized" section and the "## Related issues"
  template scrape.
- Drop bullets that already appear in [7.77.0] or [7.77.1]
  (#29758, #29861, #29795, #29740, #29531, #29654, #29685, #29863,
  #29799, #29809, #29551, #29827, #29779, #29552, #29794, #29763,
  #29527, #29221, #29710, #29691, #29676, #29686, #29693, #28977,
  #29668, #29420, #29040, #29724, #29193, #29737, #29683, #28650,
  #29425, #29323, #29662, #29388, #29351, #29454, #29473, #29712).
- Drop CI / build / sync / observability / no-changelog noise
  (#30135, #30122, #30099, #29872, #29743, #29694, #29818, #29732,
  #29920, #29678, #29687, #29386, #30002, #29824, #29757, #29587,
  #29932, #29141, #29767, #29536, #29817, #30077, #30053, #29899,
  #29597, #29502, #30030, #30035).
- Recategorize miscategorized bullets and split mid-sentence
  PR-reference line breaks (one PR per bullet, PR at end).
- Add post-bot cp-7.78.0 cherry-picks (originals on main):
  #30352 (AI disclaimer), #30259 (related-asset price pills),
  #30266 (restore gas estimate alerts), #30213 (theMiracle logo
  theme-aware), #30201 (carousel card heights).
- Footer:
  - [Unreleased]: v7.78.0...HEAD (was v7.77.1...HEAD)
  - [7.78.0]: v7.77.1...v7.78.0 (new)

Co-authored-by: Cursor <cursoragent@cursor.com>