feat: composer-centric UI refresh + Hermes Control Center (v0.50.0, closes #242)

* Polish workspace panel behavior and app dialogs

* Replace remaining emoji UI glyphs with Lucide icons

* Redesign composer footer around model and context controls

Move the model selector into the composer footer, replace the linear context pill with a compact circular badge plus tooltip, and remove the redundant topbar model pill.

Design credit and inspiration: Theo / T3 Code.
Reference implementation: https://github.com/pingdotgg/t3code/

* Remove obsolete activity bar

Drop the old activity bar, keep turn-scoped state in the composer footer, and route remaining non-chat status messages through toasts.

This leaves live tool cards and the message timeline as the primary progress UI, with the composer owning stop/cancel and brief turn status.

* Move workspace and model switching into composer footer

* Move profile switching into composer footer

* Refactor Hermes control center UI

* Redesign control center settings modal layout

Widen the modal to 860px, simplify the tab list to icon+label rows,
stretch the tab column's divider to full height, lock the panel to a
fixed height so switching tabs no longer resizes the outer shell, and
always open on the Conversation tab.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Put session item actions in a dropdown

* Use Hermes mark in sidebar control button

* Reset control center section on close

* Drop session-item left border indicator

Remove the left-border accent used for active, CLI, and project rows —
each state already has a dedicated cue (gold fill, cli badge, project
dot), so the border was redundant. Fully round the row, add 2px
bottom spacing between rows, and strip the matching JS/CSS overrides.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Increase session search input vertical padding

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Normalise odd pixel values across UI

Snap padding, gap, and border-radius values to the 2/4/6/8/10/12 grid
across composer chips, sidebar panels, cron list, settings, approval
buttons, dropdowns, and inline message edit — eliminating the 7/9/11px
drift that was making sibling elements feel subtly misaligned.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Add missing #btnMobileFiles button and .mobile-files-btn CSS (for mobile QA suite)

The mobile layout regression suite (test_mobile_layout.py) requires:
- #btnMobileFiles onclick=toggleMobileFiles() in topbar chips
- .mobile-files-btn CSS rules for responsive show/hide at 640/900px breakpoints

Also adds max-width guard to .profile-dropdown to prevent clipping at narrow viewports.

* Improve composer footer mobile responsiveness and UX

- Collapse composer chips to icon-only at <=400px viewports
- Add model chip icon (CPU) so it remains tappable when labels are hidden
- Show send button always (disabled state when empty, hidden during streaming)
- Show context usage indicator on session load, not just after streaming
- Add cancel status fallback timeout to prevent stale "Cancelling..." text
- Update tests to match new send button and busy state behavior

* Fix duplicate files button and broken workspace close on mobile

Remove redundant #btnMobileFiles button that duplicated #btnWorkspacePanelToggle
in the mobile topbar. Fix workspace panel close button calling undefined
closeMobileFiles() — now calls closeWorkspacePanel().

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Fix model chip icon vertical alignment in composer footer

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Fix workspace toggle button hidden on desktop by conflicting CSS class

Remove mobile-files-btn class from #btnWorkspacePanelToggle — its
display:none!important rule was overriding workspace-toggle-btn visibility
on non-mobile viewports.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Fix session actions dots button inaccessible on mobile sidebar

Always show the session actions trigger on mobile (no hover state on
touch devices) and restore right padding so text truncates with
ellipsis before the dots icon.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Fix composer footer manage links not opening sidebar panel

The "Manage profiles" and "Manage workspaces" links in the composer
footer dropdowns called switchPanel() which only changes the active
panel content but doesn't open the sidebar. Replaced with
mobileSwitchPanel() which also opens the sidebar so the panel is
actually visible.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Widen icon-only composer chips breakpoint from 400px to 768px

Move the icon-only chip styling up into the existing max-width:768px
media query so chips collapse to icon-only on tablets too, preventing
composer footer overflow on mid-size screens.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Fix composer-left vertical scrollbar by setting overflow-y:hidden

When overflow-x is set to auto, the CSS spec implicitly changes
overflow-y from visible to auto, allowing a vertical scrollbar to
appear from slight chip padding/border overflow. Explicitly set
overflow-y:hidden to prevent this.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: resolve rebase conflicts and fix control center test assertions

- Resolved 4 conflicts during rebase onto master (workspace.js,
  boot.js, index.html, test_sprint34.py)
- Fixed test_sprint34.py: _controlSection -> _settingsSection,
  cc-tab -> settings-tabs (matching actual implementation)
- Fixed quoting syntax error in test assertion

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: update version badge in System tab to v0.49.4

* docs: update README and CHANGELOG for v0.50.0 UI refresh, bump version badge

---------

Co-authored-by: Aron Prins <pwf.aron@gmail.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-authored-by: Nathan Esquenazi <nesquena@gmail.com>

TESTING.md

@@ -32,9 +32,11 @@ SETUP: Clear localStorage (DevTools > Application > Local Storage > delete herme
 STEPS:
   1. Navigate to http://localhost:8787
 EXPECT:
-  - Dark background, Hermes logo in sidebar header
+  - Dark background
+  - Sidebar begins directly with the icon tab row; there is no dedicated branding header
   - Center area shows "What can I help with?" heading with suggestion buttons
   - Session list in sidebar is empty or shows existing sessions
+  - Sidebar footer shows a single "Hermes WebUI" control-center button
   - No session is highlighted active
   - Send button is present but there is no input focus by default
 FAIL: Page shows error, blank white screen, or auto-creates a new session without user action.
@@ -73,11 +75,11 @@ STEPS:
 EXPECT:
   - User message appears immediately in chat
   - Thinking dots (three animated dots) appear below
-  - Status bar shows "Hermes is thinking..."
   - Send button becomes disabled (grayed out)
+  - A red stop button appears in the composer footer while the turn is running
   - Within 10-30 seconds, Hermes responds with a three-word greeting
   - Thinking dots disappear
-  - Send button re-enables
+  - Send button re-enables and the stop button disappears
   - Session title in sidebar updates to reflect the first message
 FAIL: Message never appears, thinking dots never go away, Send button stays disabled forever.
 
@@ -144,7 +146,7 @@ FAIL: New session created, error thrown, or UI breaks.
 ### T3.1: Model Dropdown Shows All Options
 SETUP: Any active session.
 STEPS:
-  1. Look at the sidebar bottom: "Model" label and a dropdown
+  1. Look at the composer footer: to the right of the attach/mic controls there is a model dropdown
   2. Click the dropdown to expand it
 EXPECT:
   - Provider groups visible: OpenAI, Anthropic, Other
@@ -153,18 +155,30 @@ EXPECT:
   - Other group: Gemini 2.5 Pro, DeepSeek V3, Llama 4 Scout
 FAIL: Only 2 options visible, no groups, or missing models.
 
-### T3.2: Model Chip Reflects Selection
+### T3.2: Model Dropdown Reflects Active Conversation
 SETUP: Active session.
 STEPS:
   1. Change model dropdown to "Claude Sonnet 4.6"
 EXPECT:
-  - The blue chip in the topbar right updates to "Sonnet 4.6" immediately
-  - NOT "GPT-5.4 Mini" (this was Bug B3, now fixed)
+  - The composer footer dropdown stays on "Claude Sonnet 4.6"
+  - Sending the next message uses that session model rather than an older one from another conversation
 STEPS (continued):
   2. Change model to "Gemini 2.5 Pro"
 EXPECT:
-  - Chip updates to "Gemini 2.5 Pro" (not "GPT-5.4 Mini")
-FAIL: Chip shows wrong model name for any non-Sonnet selection.
+  - The dropdown updates to "Gemini 2.5 Pro"
+  - Switching away and back to the conversation restores the same model in the footer selector
+FAIL: Dropdown shows the wrong active model after a session switch, or sending uses a stale model.
+
+### T3.3: Context Badge Shares Footer Space Cleanly
+SETUP: Active session with at least one completed response.
+STEPS:
+  1. Look at the right side of the composer footer
+EXPECT:
+  - A compact circular context badge appears next to the send button when usage data is available
+  - The number in the center shows the used percentage
+  - Hovering or focusing the badge shows a tooltip with percent used, token count, auto-compress threshold, and estimated cost when available
+  - The model dropdown remains usable without overlapping the send button or pushing controls out of view
+FAIL: Linear meter still shown, tooltip missing/incomplete, controls overlap, or footer wraps in a broken way.
 
 ---
 
@@ -228,8 +242,18 @@ FAIL: File not removed, error.
 
 ## Section 5: Workspace File Browser
 
-### T5.1: File Tree Loads on Session Start
+### T5.0: Panel Is Closed By Default
 SETUP: Active session with workspace set.
+EXPECT:
+  - Right workspace panel is hidden on initial load
+  - Center chat column uses the freed width
+  - "Files" toggle is visible in the topbar
+FAIL: Right panel starts open without any browsing or preview action.
+
+### T5.1: File Tree Loads When Files Panel Is Opened
+SETUP: Active session with workspace set.
+STEPS:
+  1. Click the "Files" toggle in the topbar
 EXPECT:
   - Right panel shows "WORKSPACE" header
   - File tree lists files and directories in the workspace
@@ -263,10 +287,11 @@ STEPS:
   1. Click the X button in the panel header
 EXPECT:
   - Preview closes
-  - File tree is visible again
+  - If the panel auto-opened for that preview, the entire right panel closes again
+  - If the panel was manually opened for browsing first, the file tree is visible again
   - Preview area is hidden
   - Reopening the same file shows fresh content (no stale cached text)
-FAIL: X button does nothing, tree does not reappear.
+FAIL: X button does nothing, panel stays stuck open, or the file tree does not reappear after manual browse mode.
 
 ### T5.5: Preview an Image File (Sprint 2)
 SETUP: Upload a PNG, JPG, or any image file to the workspace, OR the workspace already contains one.
@@ -377,7 +402,8 @@ FAIL: Command blocked after Allow once, card stays, error.
 ### T8.1: Download Conversation as Markdown
 SETUP: A session with at least 2 messages (1 user + 1 assistant).
 STEPS:
-  1. Click the "Transcript" download button in the sidebar bottom
+  1. Click the "Hermes" button in the sidebar footer
+  2. In the Control Center modal, click "Transcript"
 EXPECT:
   - Browser downloads a .md file named hermes-{session_id}.md
   - Opening the file shows the conversation in markdown format:
@@ -468,6 +494,7 @@ FAIL: No log output, log shows Apache-style text instead of JSON, log file not c
 SETUP: Message is sending (thinking dots visible).
 EXPECT:
   - Send button is visually grayed out
+  - Stop button is visible in the composer footer
   - Pressing Enter does NOT send another message
   - Clicking Send button does nothing
 FAIL: Multiple messages sent while one is in flight.
@@ -831,7 +858,7 @@ FAIL: No icon ever appears, icon always visible (not hover-only).
 ### T21.2: Delete a File with Confirmation
 STEPS:
   1. Hover over a file and click its trash icon
-  2. A browser confirm dialog appears: "Delete [filename]?"
+  2. An in-app confirmation modal appears: "Delete [filename]?"
   3. Click OK
 EXPECT:
   - Toast: "Deleted [filename]"
@@ -842,7 +869,7 @@ FAIL: File not deleted, no confirmation dialog, error.
 ### T21.3: Cancel Delete Does Nothing
 STEPS:
   1. Hover over a file and click its trash icon
-  2. Click Cancel on the confirm dialog
+  2. Click Cancel on the confirmation modal
 EXPECT:
   - File remains in the tree
   - No toast, no error
@@ -851,7 +878,7 @@ FAIL: File deleted despite cancel.
 ### T21.4: Create a New File
 STEPS:
   1. Click the + button in the workspace panel header
-  2. A prompt dialog appears: "New file name (e.g. notes.md):"
+  2. An in-app input modal appears: "New file name (e.g. notes.md):"
   3. Type "test-sprint4.md" and click OK
 EXPECT:
   - Toast: "Created test-sprint4.md"
@@ -925,7 +952,7 @@ FAIL: Invalid path added, no error.
 ### T22.4: Remove a Workspace
 STEPS:
   1. Click the X button next to any non-default workspace
-  2. Confirm the dialog
+  2. Confirm the modal
 EXPECT:
   - Workspace disappears from the list
   - Toast: "Workspace removed"
@@ -981,7 +1008,7 @@ STEPS:
   1. Hover over an assistant message
   2. Click the clipboard icon
 EXPECT:
-  - Icon briefly shows a checkmark (✓) then reverts to clipboard
+  - Icon briefly shows a check icon, then reverts to the copy icon
   - Paste (Cmd+V) elsewhere shows the full text of that message
 FAIL: No visual feedback, clipboard empty or wrong content.
 
@@ -994,23 +1021,23 @@ STEPS:
   1. Click any .py, .js, or .txt file in the workspace file tree
 EXPECT:
   - File content shows in read-only monospace view
-  - An "✎ Edit" button is visible in the preview path bar
+  - An Edit button with a pencil icon is visible in the preview path bar
   - Content is NOT editable (clicking in it does nothing)
 FAIL: Content immediately editable, no Edit button.
 
 ### T24.2: Edit Button Enters Edit Mode
 STEPS:
-  1. Click "✎ Edit" on a code file preview
+  1. Click the Edit button on a code file preview
 EXPECT:
   - Read-only view replaced by an editable textarea
   - Content of the file is pre-populated in the textarea
-  - Button changes to "💾 Save"
+  - Button changes to "Save" with a disk icon
 FAIL: Nothing changes, button doesn't change.
 
 ### T24.3: Save Writes Changes to Disk
 STEPS:
   1. In edit mode, change some text
-  2. Click "💾 Save"
+  2. Click the Save button
 EXPECT:
   - Read-only view returns, showing the updated content
   - Toast: "Saved"
@@ -1022,8 +1049,8 @@ STEPS:
   1. Enter edit mode on a file
   2. Make any change (type a character)
 EXPECT:
-  - Button shows "💾 Save*" (asterisk indicates unsaved changes)
-FAIL: No asterisk, button stays as "💾 Save".
+  - Button shows "Save*" with the disk icon still visible (asterisk indicates unsaved changes)
+FAIL: No asterisk, button stays as "Save".
 
 ### T24.5: Markdown File Edit-Save Roundtrip
 STEPS:
@@ -1070,7 +1097,7 @@ against each criterion below. A Claude browser agent can verify these with brows
 
 ### T25.1: Sidebar Nav Tabs are Icon-Only
 EXPECT:
-  - Five icon-only tabs in the sidebar nav row: 💬 ⏱️ 📚 🧠 📁
+  - Five icon-only tabs in the sidebar nav row: message, clock, book, brain, folder
   - No text labels visible by default (text removed to prevent overflow)
   - Hovering a tab shows a tooltip with the label (Chat/Tasks/Skills/Memory/Spaces)
   - Active tab has a blue underline, icon brighter blue
@@ -1194,7 +1221,7 @@ STEPS:
   3. Click Create job
 EXPECT:
   - Form closes
-  - Toast: "Job created ✓"
+  - Toast: "Job created"
   - New job appears in the cron list with status "active"
 FAIL: Error shown, job not created, form stays open.
 
@@ -1225,7 +1252,8 @@ FAIL: Job created, form doesn't close.
 ### T28.1: JSON Export Button Downloads File
 SETUP: Active session with at least a few messages.
 STEPS:
-  1. Click the "JSON" button in the sidebar footer (next to Transcript)
+  1. Click the "Hermes" button in the sidebar footer
+  2. In the Control Center modal, click "JSON"
 EXPECT:
   - Browser downloads a file named hermes-{session_id}.json
   - Opening the file shows valid JSON with: session_id, title, messages array,
@@ -1289,7 +1317,7 @@ STEPS (continued from T29.1):
   1. Change the name field to "Renamed Job"
   2. Click Save
 EXPECT:
-  - Form closes, toast "Job updated ✓"
+  - Form closes, toast "Job updated"
   - Job header shows new name
 FAIL: Save fails, name unchanged.
 
@@ -1297,7 +1325,7 @@ FAIL: Save fails, name unchanged.
 SETUP: A cron job you can safely delete (or a test job created for this).
 STEPS:
   1. Expand the job, click "Delete"
-  2. Confirm the dialog
+  2. Confirm the modal
 EXPECT:
   - Toast: "Job deleted"
   - Job disappears from the list
@@ -1326,7 +1354,7 @@ tags: [test]
 # Test"
   2. Click Save skill
 EXPECT:
-  - Toast "Skill created ✓", form closes
+  - Toast "Skill created", form closes
   - Skill appears in the skills list
 FAIL: Error, skill not in list.
 
@@ -1354,7 +1382,7 @@ STEPS:
   1. In edit mode, add a line to the textarea
   2. Click Save
 EXPECT:
-  - Toast "Memory saved ✓", form closes
+  - Toast "Memory saved", form closes
   - Memory panel reloads showing the updated content
 FAIL: Save fails, content unchanged.
 
@@ -1467,14 +1495,16 @@ FAIL: Both messages removed, wrong message sent, crash.
 ### T34.1: Clear Button Appears When Session Has Messages
 SETUP: Session with at least one message.
 EXPECT:
-  - A "🗑 Clear" chip appears in the topbar right side (next to the workspace chip)
-  - Button NOT visible when session has no messages / empty state
+  - The "Hermes" button is visible in the sidebar footer
+  - Opening the Control Center shows a "Clear" action in the Conversation section
+  - The Clear action is disabled when there is no active session or no messages
 FAIL: Button always visible, never visible.
 
 ### T34.2: Clear Wipes Messages and Resets Title
 STEPS:
-  1. Click the Clear button in the topbar
-  2. Confirm the dialog
+  1. Click the "Hermes" button in the sidebar footer
+  2. Click "Clear" in the Conversation section
+  3. Confirm the modal
 EXPECT:
   - All messages disappear from the chat area
   - Empty state ("What can I help with?") reappears
@@ -1485,7 +1515,7 @@ FAIL: Session deleted, messages remain, title not reset.
 
 ### T34.3: Cancel Clear Does Nothing
 STEPS:
-  1. Click Clear, then click Cancel in the confirm dialog
+  1. Click Clear, then click Cancel in the confirmation modal
 EXPECT:
   - All messages still present
   - No toast, no change
@@ -1609,7 +1639,7 @@ Each has automated API-level tests in `tests/test_sprint{N}.py`.
 - Switch model. Send a message. Verify response uses selected model.
 
 ### Sprint 12: Settings + Pin + Import
-- Click gear icon. Settings overlay opens.
+- Click the "Hermes WebUI" button in the sidebar footer. Control Center overlay opens with vertical section tabs on the left.
 - Change default model, save. Restart server. Verify setting persisted.
 - Pin a session (star icon in hover overlay). Verify it floats to top of list.
 - Export session as JSON. Import it back. Verify messages restored.
@@ -1637,11 +1667,12 @@ Each has automated API-level tests in `tests/test_sprint{N}.py`.
 
 ### Sprint 16: Sidebar Visual Polish
 - Session titles use full sidebar width (no truncated space for hidden icons).
-- Hover a session → action buttons appear from right with gradient fade.
+- Hover a session → a dotted actions trigger appears on the right.
+- Click the dotted trigger → a dropdown opens with pin, project, archive, duplicate, and delete actions.
 - All icons are monochrome SVGs (not emoji). Consistent across platforms.
 - Pinned sessions show small gold star inline. Unpinned = no star, full title width.
-- Active session has gold highlight (not blue). Overlay gradient matches.
-- Double-click to rename → overlay hides during rename.
+- Active session has gold highlight (not blue).
+- Double-click to rename → session actions hide during rename.
 
 ### Sprint 17: Workspace + Slash Commands + Send Key
 - Navigate into a subdirectory. Breadcrumb bar appears with clickable segments.
@@ -1702,7 +1733,7 @@ Each has automated API-level tests in `tests/test_sprint{N}.py`.
 - "Use" button switches profile. Delete button removes non-default profiles.
 - "+ New profile" form: name validation (lowercase + hyphens), clone config checkbox.
 - Create profile → appears in list and dropdown.
-- Delete profile → confirm dialog. Auto-switches to default if deleting active.
+- Delete profile → confirmation modal. Auto-switches to default if deleting active.
 - Attempt switch while agent busy → blocked with toast message.
 - With hermes-agent not installed → only default profile shown, graceful fallback.