feat: Firefox selection translation extension with local Ollama (initial version)

Implement the complete initial version of a Firefox WebExtension (Manifest V3)
that translates selected text on web pages using a local Ollama LLM and shows
the result in a small popover near the selection.

Specification alignment (Phase 0)
- Unified Specifications.md / Design.md / Security.md on the same approach:
  Ollama REST API + Fetch API + NDJSON streaming (no ollama-js SDK dependency)
- Fixed host_permissions to http://localhost/* and http://127.0.0.1/* because
  Firefox match patterns do not support port numbers (bug 1362809/1468162);
  the actual connection target is restricted to localhost/127.0.0.1 + any port
  by application-side validation (defense in depth, OLL-09)
- Clipboard: use navigator.clipboard.writeText() only inside the copy button
  click (user activation); no deprecated execCommand fallback

Implementation (zero dependencies, vanilla JS, no npm/Node required)
- manifest.json: MV3, background.scripts + type:module (event page, no
  service_worker), action popup, options_ui, content_scripts for http/https,
  permissions: storage + localhost host permissions only
- src/shared: constants (ports, limits, presets, error codes), message
  validation, settings schema (defaults / merge / sanitize / buildOptions /
  toApiThinking), system prompt builder (fixed prompt first + user prompt)
- src/background: message-router (runtime.Port streaming + runtime.onMessage
  for model list), translation-session (single active request, abort previous
  on new request, stale chunk suppression), ollama-client (fetch against
  /api/tags and /api/chat with buffering NDJSON line parser tolerant to chunk
  boundaries inside JSON objects, AbortController, host re-validation before
  every request, HTTP status to error-code mapping), settings-service
  (storage.local load/save with validation and fallback to defaults)
- src/content/content.js: single classic script (Firefox does not support ES
  modules in content scripts) with selection detection (selectionchange +
  mouseup + keyup, debounced), Shadow DOM action button, Shadow DOM popover
  with HIDDEN/LOADING/STREAMING/COMPLETED/ERROR state machine, port client
  with requestId-based stale chunk filtering, enabled-state sync via
  storage.onChanged; all dynamic text rendered via textContent only
- src/popup + src/options: full settings UI (enable toggle, Ollama host,
  model list from Ollama with saved-model warning, target language, thinking
  mode, temperature slider 0.0-2.0 step 0.1, context length presets
  4k/8k/16k/32k/128k/256k, seed random/fixed with integer value, user system
  prompt, advanced numeric options with steppers, stop sequences textarea)
- icons generated by tools/make-icons.ps1 (System.Drawing, no external tools)
- build.ps1 packages manifest.json + icons/ + src/ into dist zip, excluding
  tests/, doc/, ollama-js/ and tools/

Tests (71 passed, 0 failed)
- In-browser test runner (tests/test.html) with custom describe/it/assert
  framework; no npm, no Node.js
- Unit: constants sync between content mirror and shared module, Ollama host
  validation (localhost/127.0.0.1 + any port only; rejects external hosts,
  LAN IPs, https, credentials, paths), settings schema defaults and fallback,
  temperature 0.1-step validation, context length presets, seed modes,
  advanced option types, buildOptions omission of unset values and absence of
  tfs_z/mirostat fields, system prompt composition order, message validation
  with selection length boundary values
- Integration: NDJSON streaming across awkward byte boundaries, thinking
  chunk forwarding, malformed line tolerance, error payload mapping, think/
  options inclusion rules, model list, TranslationSession abort semantics,
  settings round-trip with storage.onChanged cache refresh, full port flow
  (started/chunk/completed), newer request aborts older with stale chunk
  discard, malformed message rejection, OLLAMA_UNAVAILABLE and
  INVALID_SETTINGS error paths, untrusted sender rejection

Security audit (Design.md section 24 checklist: all pass)
- No innerHTML/outerHTML/document.write/eval/new Function/localStorage
- No remote JS/CSS/fonts/CDN resources; no inline scripts in extension pages
- Ollama access limited to background; content scripts never fetch Ollama
- Background validates message type/length/requestId; single concurrent
  translation enforced
- Clipboard API only (no execCommand fallback)
- Minimal permissions: storage + localhost host permissions

Docs
- README.md with build/load/usage instructions, API list, permission rationale
- doc/Testing-Results.md with automated test results, security audit results,
  and a 14-item manual Firefox verification checklist (to be executed on a
  real Firefox + Ollama environment)

1 files changed, 43 insertions, 0 deletions

diff --git a/tools/make-icons.ps1 b/tools/make-icons.ps1
new file mode 100644
index 0000000..6c6f134
--- /dev/null
+++ b/tools/make-icons.ps1
@@ -0,0 +1,43 @@
+# Generates PNG icons from an inline SVG without external dependencies.
+# Uses Google's svg2png-free approach: renders via WPF/WinForms is complex,
+# so this script draws a simple vector-style icon with System.Drawing.
+# No Node.js, no npm, no third-party libraries.
+
+Add-Type -AssemblyName System.Drawing
+
+$size48 = 48
+$size96 = 96
+
+function New-Icon([int]$size, [string]$path) {
+  $bmp = New-Object System.Drawing.Bitmap($size, $size)
+  $g = [System.Drawing.Graphics]::FromImage($bmp)
+  $g.SmoothingMode = [System.Drawing.Drawing2D.SmoothingMode]::AntiAlias
+
+  # Background: rounded rect (drawn as filled ellipse-ish square)
+  $bgBrush = New-Object System.Drawing.SolidBrush ([System.Drawing.Color]::FromArgb(255, 26, 115, 232))
+  $g.FillEllipse($bgBrush, 1, 1, $size - 2, $size - 2)
+
+  # Translate glyph: "文A" style - draw a stylized "A" and lines
+  $white = [System.Drawing.Brushes]::White
+  $font = New-Object System.Drawing.Font ('Segoe UI', [float]($size * 0.42), [System.Drawing.FontStyle]::Bold)
+  $sf = New-Object System.Drawing.StringFormat
+  $sf.Alignment = [System.Drawing.StringAlignment]::Center
+  $sf.LineAlignment = [System.Drawing.StringAlignment]::Center
+  $rect = New-Object System.Drawing.RectangleF (0, ($size * 0.08), $size, ($size * 0.8))
+  $g.DrawString('A', $font, [System.Drawing.Brushes]::White, $rect, $sf)
+
+  # Small underline bar
+  $pen = New-Object System.Drawing.Pen ([System.Drawing.Color]::White)
+  $pen.Width = [float]($size * 0.07)
+  $g.DrawLine($pen, [float]($size * 0.25), [float]($size * 0.78), [float]($size * 0.75), [float]($size * 0.8))
+  $pen.Dispose()
+
+  $g.Dispose()
+  $bmp.Save($path, [System.Drawing.Imaging.ImageFormat]::Png)
+  $g.Dispose()
+  $bmp.Dispose()
+  Write-Host "Created $path"
+}
+
+New-Icon $size48 "icons\icon-48.png"
+New-Icon ($size48 * 2) "icons\icon-96.png"
\ No newline at end of file