docs(release): add v3.7.7 release notes

Author: tbirrell0-cell

RELEASE_v3.7.7.md

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+# Release v3.7.7 — Installer safety, rollback reliability, and mod intelligence
+
+## Installer safety and review improvements
+
+- Added pre-install review screen before any filesystem mutation. Entries are grouped into new files, overwrites, suspicious entries, blocked entries, and junk entries.
+- Added junk-entry detection: macOS metadata (`__MACOSX/`, `._*`, `.ds_store`), temp/log/cache folders, and `.bak`/`.tmp`/`.log` extensions are excluded from extraction automatically.
+- Added distinct post-install visual states: no-mutation info pill, partial-rollback warning, clean success, and hard failure — replacing the single generic red error pill.
+- Surfaced rollback failures explicitly in install results and logs.
+
+## Transactional rollback hardening
+
+- Added `TransactionService` — persists a record of every file written and overwritten during install, so rollback can remove added files and restore overwritten originals from backup.
+- `FileInstaller` now records the transaction log before touching any file and commits it atomically after a successful install.
+- `InstallQueue` propagates rollback failures into `InstallResult` for UI visibility.
+
+## Mod type detection
+
+- Added `IModTypeDetectionService` — pure, evidence-based classifier: archive entry paths in, `ModTypeDetectionResult` out. No file I/O.
+- Detects: ASI mods, ScriptHookVDotNet scripts, OIV packages, DLC packs, LSPDFR plugins, EUP clothing packs, maps/MLOs, sound packs, and config-only archives.
+- Handles nested archive roots, mixed archives, low-confidence/ambiguous inputs, and unknown archives gracefully.
+- Secondary types tracked above threshold; `IsMixed` set when primary/secondary confidence gap is narrow.
+
+## Dependency warnings
+
+- Added `IDependencyDetectionService` — pure catalog-driven mapper from `ModTypeDetectionResult` to `DependencyWarning` list.
+- Deduplicates warnings across mixed archives (e.g. ASI + Script both require Script Hook V — emitted once).
+- Dependency warnings appear in the pre-install review panel.
+- Mappings: Script → Script Hook V + ScriptHookVDotNet; ASI → Script Hook V + ASI Loader; LSPDFR Plugin → LSPDFR + RAGE Plugin Hook; OIV → OpenIV; EUP → EUP Menu.
+- All severities are warnings — no blocking without a live install probe.
+
+## Verification
+
+- 617/617 tests passing.
+- Clean build.
+
+## Issues closed
+
+- #23 Pre-install review screen
+- #24 Transactional rollback hardening
+- #25 Mod type detection service
+- #26 Dependency detection and pre-install warnings
+- #27 Install result UX polish — distinct visual states