Add Done button, tablet controls, super admin management, midnight strike reset, and activity log improvements

- Done button snaps block to full duration, marks complete, logs "Marked Done by User"; Reset after Done fully un-completes the block
- Session action buttons stretch full-width and double height for tablet tapping
- Super admin: reset password, disable/enable accounts, delete user (with cascade), last active date per user's timezone
- Disabled account login returns specific error message instead of generic invalid credentials
- Users can change own password from Admin → Settings
- Strikes reset automatically at midnight in user's configured timezone (lazy reset on page load)
- Break timer state fully restored when navigating away and back to dashboard
- Timer no longer auto-starts on navigation if it wasn't running before
- Implicit pause guard: no duplicate pause events when switching already-paused blocks or starting a break
- Block selection events removed from activity log; all event types have human-readable labels
- House emoji favicon via inline SVG data URI
- README updated to reflect all changes

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/views/LogView.vue

@@ -60,6 +60,11 @@
                       <option value="resume">↺ Resumed</option>
                       <option value="complete">✓ Completed</option>
                       <option value="skip">⟶ Skipped</option>
+                      <option value="reset">↩ Reset</option>
+                      <option value="break_start">☕ Break started</option>
+                      <option value="break_pause">⏸ Break paused</option>
+                      <option value="break_resume">↺ Break resumed</option>
+                      <option value="break_reset">↩ Break reset</option>
                     </select>
                   </div>
                   <div class="edit-field">
@@ -199,6 +204,11 @@ const EVENT_META = {
   resume:        { icon: '↺', label: 'Resumed' },
   complete:      { icon: '✓', label: 'Completed' },
   skip:          { icon: '⟶', label: 'Skipped' },
+  reset:         { icon: '↩', label: 'Reset' },
+  break_start:   { icon: '☕', label: 'Break started' },
+  break_pause:   { icon: '⏸', label: 'Break paused' },
+  break_resume:  { icon: '↺', label: 'Break resumed' },
+  break_reset:   { icon: '↩', label: 'Break reset' },
 }
 
 function eventIcon(entry) {
@@ -217,6 +227,7 @@ function eventLabel(entry) {
       : `Strike removed (${entry.new_strikes}/3)`
   }
   if (entry.event_type === 'complete' && !entry.block_label) return 'Day ended'
+  if (entry.event_type === 'complete' && entry.block_label) return `Marked Done by User — ${entry.block_label}`
   const action = EVENT_META[entry.event_type]?.label || entry.event_type
   return entry.block_label ? `${action} — ${entry.block_label}` : action
 }