feat(ai): disable local provider and improve commit file display

Local AI is now treated as unavailable in the settings UI, with a
migration to ensure any previously saved "local" selection switches
back to OpenAI. The history panel also improves how commit file
names are presented, including clearer old->new path formatting.

- Migrate stored AI provider away from local to prevent dead state
- Disable local provider option with an "in development" badge
- Refine history panel filename rendering and tooltip context

src-tauri/crates/commit_ai/src/lib.rs

@@ -413,20 +413,27 @@ do not include lines starting with 'diff --git', '@@', '+', '-', 'index ', 'Stag
 or 'Diff stat:' anywhere in your answer. \
 Format: a Conventional Commits header (<type>(<scope>): <subject>) in imperative mood, \
 max. 72 characters, then a blank line, then a body. \
-The body is required: one short paragraph explaining what changed and why, \
-then bullet points (- ...) of the key changes grouped by affected area/file. \
+The body is required: a short, general paragraph (2-4 sentences) summarizing what changed \
+and why at a high level — do NOT enumerate every changed file individually. \
+You may optionally add up to 3 bullet points (- ...) afterward, but only for the most \
+significant changes overall, never one bullet or heading per file. \
+Never use bold text, backticks, or markdown headings for file names. \
 Lines in the body max. 72 characters. \
-No preamble, no explanation, no code fences, no markdown headings, answer in English.\n\n\
+No preamble, no explanation, no code fences, answer in English.\n\n\
 Example:\n\
 Diff:\n\
 diff --git a/src/auth.py b/src/auth.py\n\
 +def hash_password(pw):\n\
-+    return bcrypt.hash(pw)\n\n\
++    return bcrypt.hash(pw)\n\
+diff --git a/src/routes.py b/src/routes.py\n\
+-if password == stored_password:\n\
++if bcrypt.check(password, stored_password):\n\n\
 Commit message:\n\
-feat(auth): add password hashing helper\n\n\
-Add a bcrypt-based helper so passwords are never stored or compared in\n\
-plain text.\n\n\
-- auth.py: add hash_password() using bcrypt"
+feat(auth): hash and verify passwords with bcrypt\n\n\
+Passwords were previously compared as plain text. This adds a bcrypt-based\n\
+hashing helper and updates the login check to verify against the hash\n\
+instead of a direct string comparison.\n\n\
+- Hash passwords on write, verify with bcrypt on login"
         .to_string();
 
     let mut user = String::new();