fix: remove fictional SessionFileCache docs and rewrite Future Improvements

[Catrya]

• Remove TODO section claiming SessionFileCache was developed but not yet integrated (never existed)
• Remove PersistentImageCache proposal that would write decrypted bytes to disk with misleading .enc extension
• Remove 5 other speculative code snippets (Nostr auth, compression options, multi-select, video support, gallery view)
• Replace with honest persistent caching principle cache encrypted blobs, decrypt only at display time
• Add download progress indication as concrete future improvement
• Remove false Next Steps claiming persistent cache was already implemented
• Keep conclusion with accurate current status

Summary by CodeRabbit

• Documentation
  • Updated supported file types: images limited to JPEG/PNG, videos to MP4/MOV/AVI, documents to DOCX with macro blocking enforced.
  • Clarified file validation via MIME detection and image sanitization (EXIF/metadata removal).
  • Revised roadmap: persistent encrypted blob caching and download progress indication highlighted as future improvements.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 1f1c3a88-bd60-41a7-9f1b-60ef2907365e

📥 Commits

Reviewing files that changed from the base of the PR and between e3370f5 and 1e2112f.

📒 Files selected for processing (1)

• docs/architecture/ENCRYPTED_IMAGE_MESSAGING_IMPLEMENTATION.md

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Walkthrough

Documentation updates to encrypted image messaging implementation specify narrowed file type support (JPEG/PNG images, MP4/MOV/AVI videos, DOCX documents), remove a detailed persistent caching TODO, and refocus Future Improvements on disk-based encrypted blob caching and download progress indication.

Changes

Cohort / File(s)	Summary
Documentation Update docs/architecture/ENCRYPTED_IMAGE_MESSAGING_IMPLEMENTATION.md	Narrowed supported file types (removed GIF/WEBP/WEBM); removed detailed persistent cache TODO section; rewrote Future Improvements to focus on disk-cached encrypted blobs and download progress indication; updated Key Achievements and Current Status/Next Steps to reflect actual implementation scope (file validation, macro detection, image sanitization, in-memory cache only).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Possibly related PRs

• fix: P2P chat messages with images block rendering until download completes #526: Refactors EncryptedImageUploadService and EncryptedFileUploadService usage with non-blocking image download/decryption, directly aligning with the documented file validation, sanitization, and download progress features.

Suggested reviewers

• AndreaDiazCorreia
• mostronatorcoder
• grunch

Poem

🐰 Whiskers twitch with glee,
Specs are clean, no more TODOs be,
JPEG and PNG, MP4 so fine,
Encrypted blobs on disk—designs align!
Progress flows like carrots divine! 🥕✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly and accurately describes the main change: removing fictional SessionFileCache documentation and rewriting the Future Improvements section.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs-media-encrypted-chat

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