Anti-harassment controls

This is the high level issue to track the work to implement the anti-harassment controls described in https://pachli.app/pachli/2024/08/02/harassment-controls.html

Notes and rough milestones follow. More specific issues will be created from these as appropriate.

All account filtering features ignore:
- Accounts you already follow
- Accounts on the local server with roles (owner, admin, etc) to ensure server admin messages are not blocked
- The account (if present) in the server's contact information (Instance - Mastodon documentation)

Possible blocklist sources

[x] #926
[ ] One or more external blocklists, by URL
- [ ] Warn or hide
- [ ] Will ignore your own domain, if it's on the list
- [ ] Filter applies in 0-N contexts
  - [ ] Home
  - [ ] Notifications
  - [ ] Conversations
  - [ ] Public timelines
  - [ ] Search
[ ] Notification specific account filters
- [x] Need to ignore server-side filters (include_filtered on request)
- [x] Warn or hide
- [x] Accounts you do follow
- [ ] Accounts that do not follow you
- [x] Accounts younger than N days
- [x] Accounts limited by your server admins
[ ] Thread specific filters
- [ ] Warn or hide
- [ ] Only show replies from accounts you follow
[ ] Conversation / DM specific filters
- [ ] Warn or hide
- [ ] Initiated by accounts you do not follow
- [ ] Initiated by accounts that do not follow you
- [ ] Initiated by accounts younger than N days
- [ ] Initiated by accounts limited by your server admins
[ ] Easier block support
- [ ] Option to require confirmation before blocking an account
  - [ ] Default on
- [ ] "Undo" option on snackbar when account is blocked
- [ ] "Show block button" preference, adds block button to bottom of each post
- [ ] "Block {domain}?" checkbox when confirming an account block
- [ ] "Prompt to block domain when blocking account" preference
[ ] Better "Report account" UI
- [ ] Select 0-N of server rules to include in the report