storkit: create 447_bug_element_tab_completion_display_name_breaks_bot_command_matching

.storkit/work/1_backlog/446_story_oauth_login_button_in_web_ui.md

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----
-name: "OAuth login button in web UI"
----
-
-# Story 446: OAuth login button in web UI
-
-## User Story
-
-As a user of the storkit web UI, I want a login button that triggers the Anthropic OAuth flow, so that I can authenticate without manually navigating to /oauth/authorize.
-
-## Acceptance Criteria
-
-- [ ] Web UI shows a login/authenticate button when no OAuth token is active
-- [ ] Clicking the button navigates to /oauth/authorize which starts the Anthropic OAuth flow
-- [ ] After successful OAuth callback, the UI updates to show the authenticated state
-- [ ] If already authenticated, the button is hidden or shows the current auth status
-
-## Out of Scope
-
-- TBD

.storkit/work/1_backlog/447_bug_element_tab_completion_display_name_breaks_bot_command_matching.md

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+---
+name: "Element tab-completion display name breaks bot command matching"
+---
+
+# Bug 447: Element tab-completion display name breaks bot command matching
+
+## Description
+
+When a user tab-completes a bot mention in Element, the Matrix client inserts the display name (e.g. `timmy ⚡️`) rather than the user ID (`@timmy`). If the display name contains emoji or special characters, the `strip_bot_mention` function in chat::util may fail to match it against the bot name, causing commands like `ambient on` to not be recognized.
+
+## How to Reproduce
+
+1. Set bot display_name to include emoji (e.g. `timmy ⚡️`) in bot.toml\n2. In Element, tab-complete the bot name to get `timmy ⚡️`\n3. Send `timmy ⚡️ ambient on`\n4. The bot does not respond — command not matched
+
+## Actual Result
+
+Bot ignores the command. The display name with emoji doesn't match during strip_bot_mention, so the command text is not correctly extracted.
+
+## Expected Result
+
+Bot should recognize commands regardless of whether the mention was tab-completed with the display name (including emoji) or typed manually as @localpart.
+
+## Acceptance Criteria
+
+- [ ] strip_bot_mention handles display names containing emoji and special characters
+- [ ] strip_bot_mention handles Element's tab-completion format (display name followed by colon or comma)
+- [ ] Commands work whether the user types @timmy, timmy, or tab-completes timmy ⚡️