Fix TypeErrors on undefined manifest entries after manifest update

[dcaslin]

Problem

After the latest manifest bump, the app threw repeated errors like:

TypeError: Cannot read properties of undefined (reading 'displayProperties')
    at c.getPlugName (main-M4HUJ7OR.js:588:25084)

and the same error from MilestoneParserService.

Root cause

Manifest updates can drop hashes that sockets / public milestones still reference. The cache lookups (getInventoryItem, getActivity, getActivityMode) return undefined for those, and several call sites dereferenced .displayProperties without a null check.

Fixes

• gear-parser.service.ts: getPlugName now returns null for missing/incomplete plug descriptions. This covers the two call sites (randomized plug set options, singleInitialItemHash) that passed unguarded lookup results in; both already continue on a null name.
• milestone-parser.service.ts (parsePublicMilestones):
  • skip activities whose hash no longer resolves (mirrors the existing milestone-level guard)
  • tolerate a missing activity mode in the missing-icon fallback
  • skip the Grasp of Avarice weekly-dungeon workaround if its hardcoded hashes are ever dropped

Testing

• 5 new regression tests (3 gear, 2 milestone) — all reproduced the exact production TypeError before the fix
• ng test: 259/259 pass; lint: 0 errors
• Version bumped to 32.0.1 per release process

Also documents copying the gitignored keys.ts into new workspaces in CLAUDE.md.

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