Clan System Part 2 - UI (#3625)

## Description:

Continuation from #3276 

Adds the complete client-side clan UI as a Lit web component
(`<clan-modal>`), a typed API client with Zod-validated responses,
shared response schemas, and a reusable `<confirm-dialog>` component.


### New: `ClanModal.ts`

| View | What it does |
|------|-------------|
| **My Clans** | Lists joined clans + pending join requests (built from
`/users/@me`, no extra fetches) |
| **Browse** | Search by tag (min 3 chars), paginated results,
configurable per-page (10/25/50) |
| **Clan Detail** | Stats, paginated + searchable member list, role
badges, join/leave/request actions |
| **Manage** | Edit name (max 35 chars) + description, toggle
open/invite-only, disband |
| **Transfer** | Leadership transfer with member selector + confirmation
|
| **Requests** | Approve/deny join requests (leader/officer) |
| **Bans** | View and unban (leader/officer) |
| **My Requests** | View and withdraw outgoing requests |

### New: `ConfirmDialog.ts`

Reusable `<confirm-dialog>` Lit component — replaces native
`confirm()`/`prompt()` which are blocked or broken on mobile and
CrazyGames iframes. Supports danger/warning variants and an optional
textarea (used for ban reasons). Fires `confirm`/`cancel` events.

### New: `ClanApi.ts`

Typed API client covering all clan endpoints. Every response is
Zod-validated. Auth header is always last in the spread (can't be
overridden by callers). Unknown server error messages always fall back
to a generic client-side string — never displayed verbatim.

### New: `ClanApiSchemas.ts` (in `src/core/`)

Shared Zod schemas for clan API responses with max-length constraints on
`name` (35) and `description` (200). Lives in `core/` so it can be
consumed by both client code and the leaderboard table.

### Modified: `ApiSchemas.ts`

- Added `clans` and `clanRequests` arrays to `UserMeResponseSchema`
- Moved clan leaderboard schemas out to `ClanApiSchemas.ts`
- Renamed `LeaderboardClanTagSchema` → `RequiredClanTagSchema`

### Modified: `Api.ts`

- Added `invalidateUserMe()` to bust the cached `/users/me` response
after mutations
- Removed `fetchClanLeaderboard` (moved to `ClanApi.ts`)

### Tests

- `ClanModal.test.ts` — rendering, view navigation, user actions
- `ClanApiQueries.test.ts` — fetch functions, error handling, pagination
- `ClanApiMutations.test.ts` — join, leave, kick, ban, promote,
transfer, etc.
- `ClanApiBans.test.ts` — ban/unban calls and error paths
- `ClanApiSchemas.test.ts` — Zod schema validation edge cases
- `LeaderboardModal.test.ts` — updated imports

## Notable design decisions

- **Not-logged-in state** — shows "Sign in to join clans" instead of
false "no clans" empty state
- **Rate limit feedback** — reads `Retry-After` header and surfaces wait
time to the user

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

w.o.n

---------

Co-authored-by: evanpelle <evanpelle@gmail.com>

resources/lang/en.json

@@ -16,6 +16,7 @@
     "summary_send": "Send",
     "summary_keep": "Keep",
     "cancel": "Cancel",
+    "confirm": "Confirm",
     "send": "Send",
     "cap_label": "Cap",
     "cap_tooltip": "Recipient’s remaining capacity",
@@ -49,6 +50,7 @@
     "leaderboard": "Leaderboard",
     "account": "Account",
     "help": "Help",
+    "clans": "Clans",
     "menu": "Menu",
     "troubleshooting": "Troubleshooting",
     "go_to_troubleshooting": "Go to our troubleshooting page"
@@ -222,6 +224,115 @@
     "logging_in": "Logging in...",
     "success": "Successfully logged in as {email}!"
   },
+  "clan_modal": {
+    "title": "Clans",
+    "my_clans": "My Clans",
+    "browse": "Browse",
+    "no_clans": "You're not in any clans yet.",
+    "sign_in_for_clans": "Sign in to join and manage clans",
+    "request_pending": "Request Pending",
+    "search_placeholder": "Search by clan tag...",
+    "no_results": "No clans found.",
+    "invite_only": "Invite Only",
+    "members": "Members",
+    "status": "Status",
+    "open": "Open",
+    "join_clan": "Join Clan",
+    "request_invite": "Request Invite",
+    "leave_clan": "Leave Clan",
+    "manage_clan": "Manage",
+    "transfer_leadership": "Transfer Leadership",
+    "clan_name": "Clan Name",
+    "description": "Description",
+    "open_clan": "Open Clan",
+    "open_clan_desc": "Anyone can join without an invite",
+    "clan_settings": "Clan Settings",
+    "save_changes": "Save Changes",
+    "promote": "Promote",
+    "demote": "Demote",
+    "kick": "Kick",
+    "danger_zone": "Danger Zone",
+    "disband_clan": "Disband Clan",
+    "transfer_warning": "This will make the selected member the new leader. You will become a regular member. This action cannot be undone.",
+    "confirm_transfer": "Transfer leadership to {name}",
+    "select_new_leader": "Select a new leader",
+    "search_members_placeholder": "Filter current page by ID or role...",
+    "search_requests_placeholder": "Search by player public ID...",
+    "per_page": "Per page",
+    "sort_by": "Sort by",
+    "sort_default": "Role",
+    "sort_total_wins": "Total Wins",
+    "sort_total_losses": "Total Losses",
+    "sort_ffa_wins": "FFA Wins",
+    "sort_ffa_losses": "FFA Losses",
+    "sort_team_wins": "Team Wins",
+    "sort_team_losses": "Team Losses",
+    "sort_hvn_wins": "HvN Wins",
+    "sort_hvn_losses": "HvN Losses",
+    "sort_ranked_wins": "Ranked Wins",
+    "sort_ranked_losses": "Ranked Losses",
+    "sort_1v1_wins": "1v1 Wins",
+    "sort_1v1_losses": "1v1 Losses",
+    "sort_order_asc": "Ascending",
+    "sort_order_desc": "Descending",
+    "join_requests": "Join Requests",
+    "no_requests": "No pending join requests.",
+    "pending_requests_count": "{count, plural, one {# pending request} other {# pending requests}}",
+    "approve": "Approve",
+    "deny": "Deny",
+    "requested_on": "Requested to join [{tag}] on {date}.",
+    "pending_applications": "Pending Applications",
+    "no_pending_applications": "No pending applications.",
+    "applied": "Applied",
+    "cancel_request": "Cancel",
+    "statistics": "Statistics",
+    "stats_total": "Total",
+    "stats_ffa": "FFA",
+    "stats_team": "Teams",
+    "stats_hvn": "HvN",
+    "stats_ranked": "Ranked",
+    "stats_1v1": "1v1",
+    "no_description": "No description",
+    "saving": "Saving...",
+    "join_request_cancelled": "Join request cancelled.",
+    "failed_to_load_clan": "Failed to load clan",
+    "join_request_sent": "Join request sent! Waiting for approval.",
+    "left_clan": "You left the clan.",
+    "settings_saved": "Clan settings saved!",
+    "clan_disbanded": "Clan disbanded.",
+    "member_promoted": "Member promoted!",
+    "member_demoted": "Member demoted.",
+    "member_kicked": "Member kicked.",
+    "leadership_transferred": "Leadership transferred!",
+    "failed_to_load_requests": "Failed to load requests",
+    "request_approved": "Request approved!",
+    "request_denied": "Request denied.",
+    "ban": "Ban",
+    "unban": "Unban",
+    "banned_players": "Banned Players",
+    "no_bans": "No banned players.",
+    "ban_reason_prompt": "Ban reason (optional, max 200 characters):",
+    "confirm_ban": "Are you sure you want to ban this player? They will be removed from the clan and unable to rejoin.",
+    "member_banned": "Player banned.",
+    "member_unbanned": "Player unbanned.",
+    "banned_by_label": "by",
+    "ban_reason": "Reason: {reason}",
+    "error_banned": "You are banned from this clan.",
+    "error_banned_reason": "You are banned from this clan. Reason: {reason}",
+    "confirm_kick": "Are you sure you want to kick this member?",
+    "confirm_disband": "Are you sure you want to disband [{tag}] {name}? This cannot be undone.",
+    "joined_date": "Member since {date}.",
+    "member_count": "{count, plural, one {# member} other {# members}}",
+    "role_leader": "Leader",
+    "role_officer": "Officer",
+    "role_member": "Member",
+    "error_already_member": "Already a member",
+    "error_request_pending": "Join request already pending",
+    "error_rate_limited_generic": "Please wait before joining another clan",
+    "error_network": "Network error",
+    "error_failed": "Action failed",
+    "error_loading": "Failed to load"
+  },
   "account_modal": {
     "title": "Account",
     "connected_as": "Connected as",