Settings overhaul + UI polish pass

Two months of iteration on the Settings panel, integration forms, and
small visual nudges across the app. Highlights:

Settings restructure
- Add Models: split into separate Local + API cards (no more in-card
  tabs); each fuses Type/Provider with the URL input.
- Added Models: new dedicated sidebar tab, with Probe + Clear-offline
  pulled into its header; Local/API sub-section icons accent-tinted.
- Search: Web Search and a new Deep Research card (Model + tuning),
  with a cross-link to AI Defaults. Provider hints use real clickable
  anchors; Web Search Test button shows a whirlpool spinner.
- AI Defaults: Image Generation card returns; Research Model card
  carries only Endpoint+Model with a cross-link to Search; Vision /
  Default / Utility fallbacks unified under one numbered-row design
  matching Search's chain.
- API Permissions (was 'API Tokens'): per-row rename, inline
  Permissions toggle that expands the scope-edit panel, in-field
  copy icons (icon→check on success). Empty state accent-tinted.
- Integrations: + Add Integration drops a type-picker menu directly
  under the button (drop-up on tight viewports); each integration
  form (API, CalDAV, CardDAV, Email, Codex/Claude, Vault, MCP) uses
  the same accent-outlined Save/Test/Cancel buttons right-aligned.
- Danger Zone: Wipe→Delete with trash icons; new 'Delete everything'
  row at the bottom that loops every category.

AI Synthesis (Reminders)
- Persona dropdown sourced from PROMPT_TEMPLATES + custom preset.
- src/reminder_personas.py mirrors the five built-ins for the
  server-side synthesis path.
- dispatch_reminder() reads reminder_llm_persona and uses the
  persona's system prompt; empty/unknown falls back to warm-neutral.

Esc handling
- Kebab menus and the provider picker intercept Esc in capture phase
  so dismissing a popup no longer closes the whole Settings modal.

Accent tinting
- Scoped CSS rule across data-settings-panel=ai/services/added-models/
  search/integrations/reminders for card h2 icons + the Added Models
  sub-section icons.

Codex/Claude integration form
- No more auto-creation on form open — explicit Create token button.
- New tokens start with every scope granted; existing tokens move out
  of the integration form into the API Permissions card.
- Setup reveal: copy buttons inline inside the token + setup code
  blocks; shorter subtitle wording.

Misc visual polish
- Save/Test/Cancel uniformly accent-outlined and right-aligned on
  every integration form.
- Provider logos render inline next to the search fallback selects
  and the Deep Research Search dropdown.
- Trash icons in fallback rows bumped to 20x20 so they fill the 32px
  button.
- Image generation default flipped to off.

routes/note_routes.py

@@ -208,14 +208,17 @@ async def dispatch_reminder(
         try:
             from src.endpoint_resolver import resolve_endpoint
             from src.llm_core import llm_call_async
+            from src.reminder_personas import synthesis_system_prompt
             url, model, headers = resolve_endpoint("utility", owner=owner or None)
             if not url:
                 url, model, headers = resolve_endpoint("default", owner=owner or None)
             if url and model:
+                persona_id = (settings.get("reminder_llm_persona") or "").strip()
+                sys_prompt = synthesis_system_prompt(persona_id)
                 raw = await llm_call_async(
                     url=url, model=model,
                     messages=[
-                        {"role": "system", "content": "You are a reminder assistant. Write a single short, warm, motivating sentence (max 25 words) reminding the user about the note below. Do not add greetings, preamble, or hashtags. Output only the sentence."},
+                        {"role": "system", "content": sys_prompt},
                         {"role": "user", "content": f"Title: {title}\n\n{note_body}".strip()},
                     ],
                     temperature=0.7, max_tokens=200, headers=headers, timeout=30,
@@ -826,6 +829,12 @@ def setup_note_routes(task_scheduler=None):
                 _override["reminder_webhook_integration_id"] = body["webhook_integration_id"]
             if body.get("webhook_payload_template"):
                 _override["reminder_webhook_payload_template"] = body["webhook_payload_template"]
+            # Mirror the in-UI AI Synthesis toggle + persona so the test
+            # actually exercises the synthesis path before/without a Save.
+            if "llm_synthesis" in body:
+                _override["reminder_llm_synthesis"] = bool(body["llm_synthesis"])
+            if "llm_persona" in body:
+                _override["reminder_llm_persona"] = str(body["llm_persona"] or "")
         else:
             db = SessionLocal()
             try: