fix: Windows path handling, light theme default, file viewer in editor, first-user admin logic

Config:
- Fixed SQLite path parsing on Windows (handle drive letters without prepending /)
- Changed default theme from dark to light
- Updated OAuth test credentials (gitea_oauth_client_id/secret)

Auth:
- First real user (excluding default admin with no password) becomes admin
- Changed user count query to exclude users without password_hash

File viewer:
- Removed separate _render_file_viewer() —

app/templates/local_workspace.html

@@ -67,7 +67,7 @@
 .modified-dot.show{display:block;}
 
 /* Offline banner */
-.offline-banner{position:fixed;top:0;left:0;right:0;background:#f85149;color:#fff;text-align:center;padding:6px 12px;font-size:12px;z-index:500;font-weight:500;}
+.offline-banner{position:fixed;top:0;left:0;right:0;background:var(--danger);color:#fff;text-align:center;padding:6px 12px;font-size:12px;z-index:500;font-weight:500;}
 
 /* Pinned indicator */
 .pin-icon{font-size:10px;color:var(--text-tertiary);cursor:pointer;margin-left:4px;opacity:0;transition:opacity 150ms;}
@@ -83,6 +83,8 @@
 .bulk-bar{display:flex;align-items:center;gap:10px;padding:8px 12px;background:var(--accent);color:#fff;border-radius:8px;margin-bottom:10px;font-size:13px;font-weight:500;}
 .bulk-bar .btn-danger{background:rgba(255,255,255,.15);color:#fff;border:1px solid rgba(255,255,255,.3);}
 .bulk-bar .btn-secondary{background:rgba(255,255,255,.1);color:#fff;border:1px solid rgba(255,255,255,.2);}
+[data-theme="light"] .bulk-bar .btn-danger{background:rgba(0,0,0,.08);color:var(--text-primary);border:1px solid var(--border);}
+[data-theme="light"] .bulk-bar .btn-secondary{background:rgba(0,0,0,.05);color:var(--text-primary);border:1px solid var(--border);}
 
 /* Table view */
 .ws-table{width:100%;border-collapse:collapse;font-size:13px;}
@@ -94,8 +96,8 @@
 .ws-table .table-name:hover{color:var(--accent);}
 .ws-table .table-meta{color:var(--text-tertiary);font-size:12px;}
 
-.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.6);display:flex;align-items:center;justify-content:center;z-index:999;backdrop-filter:blur(4px);}
-.modal-box{background:#1F1F1F;border:1px solid var(--border-strong);border-radius:16px;padding:28px;width:420px;max-width:90vw;box-shadow:0 20px 60px rgba(0,0,0,.5);}
+.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.4);display:flex;align-items:center;justify-content:center;z-index:999;backdrop-filter:blur(4px);}
+.modal-box{background:var(--bg-modal);border:1px solid var(--border);border-radius:var(--radius-lg);padding:28px;width:420px;max-width:90vw;box-shadow:var(--shadow-modal);}
 .modal-box h3{font-size:16px;margin-bottom:6px;display:flex;align-items:center;gap:8px;}
 .modal-box .modal-sub{font-size:12px;color:var(--text-tertiary);margin-bottom:20px;}
 .modal-input{width:100%;padding:12px;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:10px;color:var(--text);font-size:14px;outline:none;}
@@ -117,7 +119,7 @@
 .drop-overlay .drop-hint{background:var(--bg);border:2px dashed var(--accent);border-radius:16px;padding:40px 60px;text-align:center;color:var(--text);font-size:16px;}
 .drop-overlay .drop-hint .icon{font-size:48px;display:block;margin-bottom:12px;}
 .drop-target-highlight{outline:2px solid var(--accent)!important;outline-offset:-2px;border-radius:6px;background:rgba(35,131,226,.1)!important;}
-.upload-progress{position:fixed;bottom:24px;right:24px;background:var(--bg);border:1px solid var(--border-strong);border-radius:12px;padding:16px 20px;z-index:200;box-shadow:0 8px 30px rgba(0,0,0,.4);min-width:200px;}
+.upload-progress{position:fixed;bottom:24px;right:24px;background:var(--bg-modal);border:1px solid var(--border);border-radius:12px;padding:16px 20px;z-index:200;box-shadow:var(--shadow-popover);min-width:200px;}
 .upload-progress .up-bar{height:4px;background:var(--bg-tertiary);border-radius:2px;margin-top:8px;overflow:hidden;}
 .upload-progress .up-bar-fill{height:100%;background:var(--accent);border-radius:2px;transition:width 200ms;}
 
@@ -153,7 +155,7 @@
 .sort-select:focus{border-color:var(--accent);}
 
 /* Undo toast */
-.undo-toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:var(--bg);border:1px solid var(--border-strong);border-radius:12px;padding:10px 20px;z-index:300;box-shadow:0 8px 30px rgba(0,0,0,.5);display:flex;align-items:center;gap:12px;font-size:13px;}
+.undo-toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:var(--bg-modal);border:1px solid var(--border);border-radius:12px;padding:10px 20px;z-index:300;box-shadow:var(--shadow-popover);display:flex;align-items:center;gap:12px;font-size:13px;}
 .undo-btn{background:var(--accent);color:#fff;border:none;padding:4px 12px;border-radius:6px;cursor:pointer;font-size:12px;font-weight:600;}
 .undo-btn:hover{opacity:.85;}
 .undo-dismiss{background:none;border:none;color:var(--text-tertiary);cursor:pointer;font-size:18px;padding:0 4px;}
@@ -171,9 +173,9 @@
 .path-go:hover{opacity:.85;}
 
 /* File preview tooltip */
-.file-preview{position:fixed;z-index:300;background:#1a1a1a;background:var(--bg,#1a1a1a);border:1px solid var(--border-strong,#333);border-radius:10px;box-shadow:0 8px 30px rgba(0,0,0,.5);max-width:400px;min-width:200px;pointer-events:auto;}
-.file-preview-header{padding:8px 12px;font-size:12px;font-weight:600;color:var(--text-secondary,#888);border-bottom:1px solid var(--border,#333);}
-.file-preview-body{padding:10px 12px;margin:0;font-size:12px;line-height:1.5;color:var(--text,#ddd);max-height:200px;overflow:auto;font-family:'Fira Code','Cascadia Code',monospace;white-space:pre-wrap;word-wrap:break-word;background:#141414;}
+.file-preview{position:fixed;z-index:300;background:var(--bg-modal);border:1px solid var(--border);border-radius:10px;box-shadow:var(--shadow-popover);max-width:400px;min-width:200px;pointer-events:auto;}
+.file-preview-header{padding:8px 12px;font-size:12px;font-weight:600;color:var(--text-secondary);border-bottom:1px solid var(--border);}
+.file-preview-body{padding:10px 12px;margin:0;font-size:12px;line-height:1.5;color:var(--text);max-height:200px;overflow:auto;font-family:'Fira Code','Cascadia Code',monospace;white-space:pre-wrap;word-wrap:break-word;background:var(--bg-secondary);}
 
 /* Tag chips */
 .tag-chip{display:inline-flex;align-items:center;gap:2px;padding:1px 8px;border-radius:10px;font-size:11px;color:#fff;white-space:nowrap;margin:1px 2px;transition:all 150ms;}
@@ -254,13 +256,13 @@
 .view-dropdown-btn{display:flex;align-items:center;gap:6px;padding:5px 10px;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:6px;cursor:pointer;font-size:12px;color:var(--text);white-space:nowrap;}
 .view-dropdown-btn:hover{background:var(--bg-hover);border-color:var(--accent);}
 .dropdown-arrow{font-size:10px;color:var(--text-tertiary);}
-.view-dropdown-menu{position:absolute;top:100%;left:0;margin-top:4px;background:#1E1E1E;border:1px solid var(--border-strong);border-radius:8px;box-shadow:0 8px 24px rgba(0,0,0,.6);z-index:250;min-width:140px;overflow:hidden;}
+.view-dropdown-menu{position:absolute;top:100%;left:0;margin-top:4px;background:var(--bg-modal);border:1px solid var(--border);border-radius:var(--radius-md);box-shadow:var(--shadow-popover);z-index:250;min-width:140px;overflow:hidden;}
 .view-menu-item{display:flex;align-items:center;gap:8px;width:100%;padding:8px 12px;background:none;border:none;color:var(--text);font-size:13px;cursor:pointer;text-align:left;}
 .view-menu-item:hover{background:var(--bg-hover);}
 .view-menu-item.active{background:rgba(35,131,226,.12);color:var(--accent);font-weight:500;}
 
 /* Context menu */
-.ctx-menu{position:fixed;background:#1E1E1E;border:1px solid var(--border-strong);border-radius:10px;box-shadow:0 8px 24px rgba(0,0,0,.5);min-width:200px;z-index:600;padding:4px 0;max-height:80vh;overflow-y:auto;}
+.ctx-menu{position:fixed;background:var(--bg-modal);border:1px solid var(--border);border-radius:10px;box-shadow:var(--shadow-popover);min-width:200px;z-index:600;padding:4px 0;max-height:80vh;overflow-y:auto;}
 .ctx-item{display:flex;align-items:center;gap:8px;padding:7px 14px;font-size:13px;color:var(--text);cursor:pointer;transition:background 100ms;}
 .ctx-item:hover{background:var(--bg-hover);}
 .ctx-item.ctx-danger{color:var(--danger);}