feat(settings): user-configurable typography controls for chat and input (#172)

* feat(settings): add text size slider for chat and input

Signed-off-by: Logan Nguyen <lg.131.dev@gmail.com>

* fix(settings): make NumberSlider commit reliably on single click and quick keystroke

Signed-off-by: Logan Nguyen <lg.131.dev@gmail.com>

* fix(config): preserve schema-correct TOML type when inserting a missing field

Signed-off-by: Logan Nguyen <lg.131.dev@gmail.com>

* fix(settings): prefer schema template over on-disk item type when patching config

Signed-off-by: Logan Nguyen <lg.131.dev@gmail.com>

* feat(settings): add line-height, letter-spacing, and font-weight typography controls

Signed-off-by: Logan Nguyen <lg.131.dev@gmail.com>

* refactor(settings): swap font-weight dropdown for slider with descriptive labels

Signed-off-by: Logan Nguyen <lg.131.dev@gmail.com>

* fix(review): fix em dash in doc comment, dead branch, v8 ignore patterns, and coverage gaps

Signed-off-by: Logan Nguyen <lg.131.dev@gmail.com>

---------

Signed-off-by: Logan Nguyen <lg.131.dev@gmail.com>

Author: quiet-node

docs/configurations.md

@@ -52,6 +52,10 @@ system = "..."
 overlay_width = 600
 max_chat_height = 648
 max_images = 3
+text_base_px = 15.0
+text_line_height = 1.5
+text_letter_spacing_px = 0.0
+text_font_weight = 500
 
 [quote]
 max_display_lines = 4
@@ -146,6 +150,10 @@ UI configuration for the floating Thuki window: geometry knobs and input attachm
 | `overlay_width`   | `600.0` | Yes      | —               | `[200.0, 2000.0]` | How wide the floating Thuki window is, in pixels. Raise for wider input/chat at the cost of more screen space; lower to keep Thuki compact.                                            |
 | `max_chat_height` | `648.0` | Yes      | —               | `[200.0, 2000.0]` | The largest the chat window can grow to as conversation gets longer. Raise to see more chat history without scrolling; lower to keep Thuki from taking over your screen on long chats. |
 | `max_images`      | `3`     | Yes      | —               | `[1, 20]`         | Maximum number of images you can manually attach to a single message by pasting or dragging. A /screen capture always counts as one extra on top of this limit. Raise for richer visual context per message; lower to keep prompts compact. |
+| `text_base_px`    | `15.0`  | Yes      | —               | `[11.0, 22.0]`    | Base font size for chat text and the AskBar input, in CSS pixels. Drives the `--thuki-text-base` CSS variable consumed by the AI markdown body, the user chat bubble text, and the AskBar textarea (plus its caret-tracking mirror). Other surfaces (Settings panel, onboarding) keep fixed sizes. Raise for easier-to-read conversation text; lower to fit more text on screen. |
+| `text_line_height` | `1.5` | Yes      | —               | `[1.0, 2.5]`      | Line-height multiplier applied to chat text and the AskBar input. Drives the `--thuki-text-line-height` CSS variable. Raise for airier, easier-to-skim replies; lower to fit more lines on screen. |
+| `text_letter_spacing_px` | `0.0` | Yes | —             | `[-0.5, 2.0]`     | Extra space between characters, in CSS pixels. Drives the `--thuki-text-letter-spacing` CSS variable. Raise for airier letters; drop below zero to tighten the typography. |
+| `text_font_weight` | `500` | Yes      | —               | `{400, 500, 600, 700}` | CSS `font-weight` applied to chat and AskBar text. Drives the `--thuki-text-font-weight` CSS variable. Only the four loaded Nunito weights are accepted; off-grid values reset to the default. Raise for a heavier presence; lower for a lighter look. |
 | `COLLAPSED_WINDOW_HEIGHT` | `80 px` | No | Frontend constant; overwritten by ResizeObserver before the frame renders, so any value in the user-visible range produces identical results. | — | The initial height of the collapsed input bar, in pixels. Overwritten by ResizeObserver on every render, so the value the user sees is always determined dynamically. |
 | `HIDE_COMMIT_DELAY_MS` | `350 ms` | No | Frontend constant; the value sits below normal perception across its usable range and creates a visible pop if dropped below the exit-animation duration. | — | How long Thuki waits after you close the window before it hides the underlying NSPanel. Keeps the exit animation from being cut off. |
 

src-tauri/src/config/defaults.rs

@@ -61,6 +61,31 @@ pub const DEFAULT_MAX_CHAT_HEIGHT: f64 = 648.0;
 /// per-message image count is max_images + 1. Raise for more visual context
 /// per message; lower to keep prompts compact.
 pub const DEFAULT_MAX_IMAGES: u32 = 3;
+/// Base font size (in CSS pixels) for chat text and the AskBar input.
+/// Drives the `--thuki-text-base` CSS variable on `<html>`, which the AI
+/// markdown body, the user chat bubble text, and the AskBar textarea +
+/// caret-tracking mirror all read. Other surfaces (Settings panel,
+/// onboarding) keep fixed sizes. Raise for easier-to-read conversation
+/// text; lower to fit more text on screen.
+pub const DEFAULT_TEXT_BASE_PX: f64 = 15.0;
+
+/// Line-height multiplier applied to chat + AskBar text. Drives the
+/// `--thuki-text-line-height` CSS variable. 1.5 sits between the AskBar
+/// default (~1.25) and the previous AI-prose default (1.6); users can dial
+/// up for airier prose or down for denser screens.
+pub const DEFAULT_TEXT_LINE_HEIGHT: f64 = 1.5;
+
+/// Letter spacing applied to chat + AskBar text, in CSS pixels. Drives the
+/// `--thuki-text-letter-spacing` CSS variable. 0 keeps Nunito's native
+/// tracking; raise for airier characters, drop below zero to tighten.
+pub const DEFAULT_TEXT_LETTER_SPACING_PX: f64 = 0.0;
+
+/// Numeric CSS `font-weight` applied to chat + AskBar text. Drives the
+/// `--thuki-text-font-weight` CSS variable. Only the four loaded Nunito
+/// weights are accepted; intermediate values would silently fall back to
+/// the nearest loaded glyph set, making the slider misleading.
+pub const DEFAULT_TEXT_FONT_WEIGHT: u32 = 500;
+pub const ALLOWED_FONT_WEIGHTS: &[u32] = &[400, 500, 600, 700];
 
 /// Quote display defaults.
 pub const DEFAULT_QUOTE_MAX_DISPLAY_LINES: u32 = 4;
@@ -74,6 +99,20 @@ pub const DEFAULT_QUOTE_MAX_CONTEXT_LENGTH: u32 = 4096;
 pub const BOUNDS_OVERLAY_WIDTH: (f64, f64) = (200.0, 2000.0);
 pub const BOUNDS_MAX_CHAT_HEIGHT: (f64, f64) = (200.0, 2000.0);
 pub const BOUNDS_MAX_IMAGES: (u32, u32) = (1, 20);
+/// Accepted range for `window.text_base_px`. 11 px is the floor for legibility
+/// on a retina panel; 22 px is the ceiling before line wrapping in the AskBar
+/// stops looking right at the default overlay width. Values outside the range,
+/// or non-finite values, are reset to `DEFAULT_TEXT_BASE_PX` by the loader.
+pub const BOUNDS_TEXT_BASE_PX: (f64, f64) = (11.0, 22.0);
+
+/// Accepted range for `window.text_line_height` (unitless CSS multiplier).
+/// 1.0 collapses lines to glyph height (legibility floor); 2.5 is well past
+/// any reasonable airy-prose setting.
+pub const BOUNDS_TEXT_LINE_HEIGHT: (f64, f64) = (1.0, 2.5);
+
+/// Accepted range for `window.text_letter_spacing_px` (CSS pixels). Negative
+/// values tighten the typography; positive values airy it out.
+pub const BOUNDS_TEXT_LETTER_SPACING_PX: (f64, f64) = (-0.5, 2.0);
 pub const BOUNDS_QUOTE_MAX_DISPLAY_LINES: (u32, u32) = (1, 100);
 pub const BOUNDS_QUOTE_MAX_DISPLAY_CHARS: (u32, u32) = (1, 10_000);
 pub const BOUNDS_QUOTE_MAX_CONTEXT_LENGTH: (u32, u32) = (1, 65_536);
@@ -249,6 +288,10 @@ pub const ALLOWED_FIELDS: &[(&str, &str)] = &[
     ("window", "overlay_width"),
     ("window", "max_chat_height"),
     ("window", "max_images"),
+    ("window", "text_base_px"),
+    ("window", "text_line_height"),
+    ("window", "text_letter_spacing_px"),
+    ("window", "text_font_weight"),
     // [quote]
     ("quote", "max_display_lines"),
     ("quote", "max_display_chars"),

src-tauri/src/config/loader.rs

@@ -22,19 +22,21 @@ use std::path::{Path, PathBuf};
 use std::time::{SystemTime, UNIX_EPOCH};
 
 use super::defaults::{
-    BOUNDS_KEEP_WARM_INACTIVITY_MINUTES, BOUNDS_MAX_CHAT_HEIGHT, BOUNDS_MAX_IMAGES,
-    BOUNDS_MAX_ITERATIONS, BOUNDS_NUM_CTX, BOUNDS_OVERLAY_WIDTH,
+    ALLOWED_FONT_WEIGHTS, BOUNDS_KEEP_WARM_INACTIVITY_MINUTES, BOUNDS_MAX_CHAT_HEIGHT,
+    BOUNDS_MAX_IMAGES, BOUNDS_MAX_ITERATIONS, BOUNDS_NUM_CTX, BOUNDS_OVERLAY_WIDTH,
     BOUNDS_PIPELINE_WALL_CLOCK_BUDGET_S, BOUNDS_QUOTE_MAX_CONTEXT_LENGTH,
     BOUNDS_QUOTE_MAX_DISPLAY_CHARS, BOUNDS_QUOTE_MAX_DISPLAY_LINES, BOUNDS_SEARXNG_MAX_RESULTS,
-    BOUNDS_TIMEOUT_S, BOUNDS_TOP_K_URLS, BOUNDS_UPDATER_CHECK_INTERVAL_HOURS,
-    DEFAULT_JUDGE_TIMEOUT_S, DEFAULT_KEEP_WARM_INACTIVITY_MINUTES, DEFAULT_MAX_CHAT_HEIGHT,
-    DEFAULT_MAX_IMAGES, DEFAULT_MAX_ITERATIONS, DEFAULT_NUM_CTX, DEFAULT_OLLAMA_URL,
-    DEFAULT_OVERLAY_WIDTH, DEFAULT_PIPELINE_WALL_CLOCK_BUDGET_S, DEFAULT_QUOTE_MAX_CONTEXT_LENGTH,
+    BOUNDS_TEXT_BASE_PX, BOUNDS_TEXT_LETTER_SPACING_PX, BOUNDS_TEXT_LINE_HEIGHT, BOUNDS_TIMEOUT_S,
+    BOUNDS_TOP_K_URLS, BOUNDS_UPDATER_CHECK_INTERVAL_HOURS, DEFAULT_JUDGE_TIMEOUT_S,
+    DEFAULT_KEEP_WARM_INACTIVITY_MINUTES, DEFAULT_MAX_CHAT_HEIGHT, DEFAULT_MAX_IMAGES,
+    DEFAULT_MAX_ITERATIONS, DEFAULT_NUM_CTX, DEFAULT_OLLAMA_URL, DEFAULT_OVERLAY_WIDTH,
+    DEFAULT_PIPELINE_WALL_CLOCK_BUDGET_S, DEFAULT_QUOTE_MAX_CONTEXT_LENGTH,
     DEFAULT_QUOTE_MAX_DISPLAY_CHARS, DEFAULT_QUOTE_MAX_DISPLAY_LINES,
     DEFAULT_READER_BATCH_TIMEOUT_S, DEFAULT_READER_PER_URL_TIMEOUT_S, DEFAULT_READER_URL,
     DEFAULT_ROUTER_TIMEOUT_S, DEFAULT_SEARCH_TIMEOUT_S, DEFAULT_SEARXNG_MAX_RESULTS,
-    DEFAULT_SEARXNG_URL, DEFAULT_SYSTEM_PROMPT_BASE, DEFAULT_TOP_K_URLS,
-    DEFAULT_UPDATER_CHECK_INTERVAL_HOURS, DEFAULT_UPDATER_MANIFEST_URL,
+    DEFAULT_SEARXNG_URL, DEFAULT_SYSTEM_PROMPT_BASE, DEFAULT_TEXT_BASE_PX,
+    DEFAULT_TEXT_FONT_WEIGHT, DEFAULT_TEXT_LETTER_SPACING_PX, DEFAULT_TEXT_LINE_HEIGHT,
+    DEFAULT_TOP_K_URLS, DEFAULT_UPDATER_CHECK_INTERVAL_HOURS, DEFAULT_UPDATER_MANIFEST_URL,
     SLASH_COMMAND_PROMPT_APPENDIX,
 };
 use super::error::ConfigError;
@@ -184,6 +186,29 @@ pub(crate) fn resolve(config: &mut AppConfig) {
         DEFAULT_MAX_IMAGES,
         "window.max_images",
     );
+    clamp_f64(
+        &mut config.window.text_base_px,
+        BOUNDS_TEXT_BASE_PX,
+        DEFAULT_TEXT_BASE_PX,
+        "window.text_base_px",
+    );
+    clamp_f64(
+        &mut config.window.text_line_height,
+        BOUNDS_TEXT_LINE_HEIGHT,
+        DEFAULT_TEXT_LINE_HEIGHT,
+        "window.text_line_height",
+    );
+    clamp_f64(
+        &mut config.window.text_letter_spacing_px,
+        BOUNDS_TEXT_LETTER_SPACING_PX,
+        DEFAULT_TEXT_LETTER_SPACING_PX,
+        "window.text_letter_spacing_px",
+    );
+    clamp_font_weight(
+        &mut config.window.text_font_weight,
+        DEFAULT_TEXT_FONT_WEIGHT,
+        "window.text_font_weight",
+    );
 
     // Quote section.
     clamp_u32(
@@ -348,6 +373,16 @@ fn clamp_u64(value: &mut u64, bounds: (u64, u64), default: u64, field: &str) {
     }
 }
 
+fn clamp_font_weight(value: &mut u32, default: u32, field: &str) {
+    if !ALLOWED_FONT_WEIGHTS.contains(value) {
+        eprintln!(
+            "thuki: [config] {field}={value} not in {ALLOWED_FONT_WEIGHTS:?}; using default {default}",
+            value = *value
+        );
+        *value = default;
+    }
+}
+
 fn clamp_u32(value: &mut u32, bounds: (u32, u32), default: u32, field: &str) {
     if !(bounds.0..=bounds.1).contains(value) {
         eprintln!(

src-tauri/src/config/schema.rs

@@ -21,8 +21,10 @@ use super::defaults::{
     DEFAULT_QUOTE_MAX_DISPLAY_LINES, DEFAULT_READER_BATCH_TIMEOUT_S,
     DEFAULT_READER_PER_URL_TIMEOUT_S, DEFAULT_READER_URL, DEFAULT_ROUTER_TIMEOUT_S,
     DEFAULT_SEARCH_TIMEOUT_S, DEFAULT_SEARXNG_MAX_RESULTS, DEFAULT_SEARXNG_URL,
-    DEFAULT_SYSTEM_CUSTOMIZED, DEFAULT_SYSTEM_PROMPT_BASE, DEFAULT_TOP_K_URLS,
-    DEFAULT_UPDATER_AUTO_CHECK, DEFAULT_UPDATER_CHECK_INTERVAL_HOURS, DEFAULT_UPDATER_MANIFEST_URL,
+    DEFAULT_SYSTEM_CUSTOMIZED, DEFAULT_SYSTEM_PROMPT_BASE, DEFAULT_TEXT_BASE_PX,
+    DEFAULT_TEXT_FONT_WEIGHT, DEFAULT_TEXT_LETTER_SPACING_PX, DEFAULT_TEXT_LINE_HEIGHT,
+    DEFAULT_TOP_K_URLS, DEFAULT_UPDATER_AUTO_CHECK, DEFAULT_UPDATER_CHECK_INTERVAL_HOURS,
+    DEFAULT_UPDATER_MANIFEST_URL,
 };
 
 /// Static, user-tunable inference daemon configuration.
@@ -116,6 +118,25 @@ pub struct WindowSection {
     /// image from /screen capture is allowed on top, for a total of
     /// max_images + 1 per message.
     pub max_images: u32,
+    /// Base font size (in CSS pixels) for chat text and the AskBar input.
+    /// Drives the `--thuki-text-base` CSS variable consumed by the AI
+    /// markdown body, the user chat bubble text, and the AskBar textarea
+    /// (plus its caret-tracking mirror). Other UI surfaces keep fixed sizes.
+    /// Valid range: 11.0..=22.0.
+    pub text_base_px: f64,
+    /// Line-height multiplier applied to chat + AskBar text. Drives the
+    /// `--thuki-text-line-height` CSS variable. Valid range: 1.0..=2.5.
+    pub text_line_height: f64,
+    /// Letter spacing (in CSS pixels) applied to chat + AskBar text.
+    /// Drives the `--thuki-text-letter-spacing` CSS variable. Negative
+    /// values tighten the typography; positive values airy it out.
+    /// Valid range: -0.5..=2.0.
+    pub text_letter_spacing_px: f64,
+    /// CSS `font-weight` applied to chat + AskBar text. Drives the
+    /// `--thuki-text-font-weight` CSS variable. Restricted to the four
+    /// loaded Nunito weights (400, 500, 600, 700); values outside this
+    /// set reset to the compiled default.
+    pub text_font_weight: u32,
 }
 
 impl Default for WindowSection {
@@ -124,6 +145,10 @@ impl Default for WindowSection {
             overlay_width: DEFAULT_OVERLAY_WIDTH,
             max_chat_height: DEFAULT_MAX_CHAT_HEIGHT,
             max_images: DEFAULT_MAX_IMAGES,
+            text_base_px: DEFAULT_TEXT_BASE_PX,
+            text_line_height: DEFAULT_TEXT_LINE_HEIGHT,
+            text_letter_spacing_px: DEFAULT_TEXT_LETTER_SPACING_PX,
+            text_font_weight: DEFAULT_TEXT_FONT_WEIGHT,
         }
     }
 }

src-tauri/src/config/tests.rs

@@ -19,8 +19,9 @@ use super::defaults::{
     DEFAULT_QUOTE_MAX_DISPLAY_CHARS, DEFAULT_QUOTE_MAX_DISPLAY_LINES,
     DEFAULT_READER_BATCH_TIMEOUT_S, DEFAULT_READER_PER_URL_TIMEOUT_S, DEFAULT_READER_URL,
     DEFAULT_ROUTER_TIMEOUT_S, DEFAULT_SEARCH_TIMEOUT_S, DEFAULT_SEARXNG_MAX_RESULTS,
-    DEFAULT_SEARXNG_URL, DEFAULT_SYSTEM_PROMPT_BASE, DEFAULT_TOP_K_URLS,
-    DEFAULT_UPDATER_CHECK_INTERVAL_HOURS, DEFAULT_UPDATER_MANIFEST_URL,
+    DEFAULT_SEARXNG_URL, DEFAULT_SYSTEM_PROMPT_BASE, DEFAULT_TEXT_BASE_PX,
+    DEFAULT_TEXT_FONT_WEIGHT, DEFAULT_TEXT_LETTER_SPACING_PX, DEFAULT_TEXT_LINE_HEIGHT,
+    DEFAULT_TOP_K_URLS, DEFAULT_UPDATER_CHECK_INTERVAL_HOURS, DEFAULT_UPDATER_MANIFEST_URL,
     SLASH_COMMAND_PROMPT_APPENDIX,
 };
 use super::error::ConfigError;
@@ -61,6 +62,13 @@ fn defaults_const_values_match_schema_defaults() {
     assert_eq!(c.window.overlay_width, DEFAULT_OVERLAY_WIDTH);
     assert_eq!(c.window.max_chat_height, DEFAULT_MAX_CHAT_HEIGHT);
     assert_eq!(c.window.max_images, DEFAULT_MAX_IMAGES);
+    assert_eq!(c.window.text_base_px, DEFAULT_TEXT_BASE_PX);
+    assert_eq!(c.window.text_line_height, DEFAULT_TEXT_LINE_HEIGHT);
+    assert_eq!(
+        c.window.text_letter_spacing_px,
+        DEFAULT_TEXT_LETTER_SPACING_PX
+    );
+    assert_eq!(c.window.text_font_weight, DEFAULT_TEXT_FONT_WEIGHT);
     assert_eq!(c.quote.max_display_lines, DEFAULT_QUOTE_MAX_DISPLAY_LINES);
     assert_eq!(c.quote.max_display_chars, DEFAULT_QUOTE_MAX_DISPLAY_CHARS);
     assert_eq!(c.quote.max_context_length, DEFAULT_QUOTE_MAX_CONTEXT_LENGTH);
@@ -101,6 +109,10 @@ fn section_defaults_are_sensible() {
     let w = WindowSection::default();
     assert_eq!(w.overlay_width, DEFAULT_OVERLAY_WIDTH);
     assert_eq!(w.max_images, DEFAULT_MAX_IMAGES);
+    assert_eq!(w.text_base_px, DEFAULT_TEXT_BASE_PX);
+    assert_eq!(w.text_line_height, DEFAULT_TEXT_LINE_HEIGHT);
+    assert_eq!(w.text_letter_spacing_px, DEFAULT_TEXT_LETTER_SPACING_PX);
+    assert_eq!(w.text_font_weight, DEFAULT_TEXT_FONT_WEIGHT);
 
     let q = QuoteSection::default();
     assert_eq!(q.max_display_lines, DEFAULT_QUOTE_MAX_DISPLAY_LINES);
@@ -618,6 +630,103 @@ fn resolve_out_of_bounds_max_images_resets_to_default() {
     assert_eq!(config_high.window.max_images, DEFAULT_MAX_IMAGES);
 }
 
+#[test]
+fn resolve_out_of_bounds_text_base_px_resets_to_default() {
+    let dir = fresh_temp_dir();
+    let path = config_path_in(&dir);
+    std::fs::write(&path, "[window]\ntext_base_px = 6.0\n").unwrap();
+    let too_low = load_from_path(&path).unwrap();
+    assert_eq!(too_low.window.text_base_px, DEFAULT_TEXT_BASE_PX);
+
+    std::fs::write(&path, "[window]\ntext_base_px = 99.0\n").unwrap();
+    let too_high = load_from_path(&path).unwrap();
+    assert_eq!(too_high.window.text_base_px, DEFAULT_TEXT_BASE_PX);
+
+    std::fs::write(&path, "[window]\ntext_base_px = nan\n").unwrap();
+    let non_finite = load_from_path(&path).unwrap();
+    assert_eq!(non_finite.window.text_base_px, DEFAULT_TEXT_BASE_PX);
+}
+
+#[test]
+fn resolve_text_base_px_in_bounds_preserved() {
+    let dir = fresh_temp_dir();
+    let path = config_path_in(&dir);
+    std::fs::write(&path, "[window]\ntext_base_px = 18.0\n").unwrap();
+    let config = load_from_path(&path).unwrap();
+    assert_eq!(config.window.text_base_px, 18.0);
+}
+
+#[test]
+fn resolve_out_of_bounds_text_line_height_resets_to_default() {
+    let dir = fresh_temp_dir();
+    let path = config_path_in(&dir);
+    std::fs::write(&path, "[window]\ntext_line_height = 0.5\n").unwrap();
+    let too_low = load_from_path(&path).unwrap();
+    assert_eq!(too_low.window.text_line_height, DEFAULT_TEXT_LINE_HEIGHT);
+
+    std::fs::write(&path, "[window]\ntext_line_height = 9.0\n").unwrap();
+    let too_high = load_from_path(&path).unwrap();
+    assert_eq!(too_high.window.text_line_height, DEFAULT_TEXT_LINE_HEIGHT);
+
+    std::fs::write(&path, "[window]\ntext_line_height = nan\n").unwrap();
+    let non_finite = load_from_path(&path).unwrap();
+    assert_eq!(non_finite.window.text_line_height, DEFAULT_TEXT_LINE_HEIGHT);
+}
+
+#[test]
+fn resolve_out_of_bounds_text_letter_spacing_resets_to_default() {
+    let dir = fresh_temp_dir();
+    let path = config_path_in(&dir);
+    std::fs::write(&path, "[window]\ntext_letter_spacing_px = -5.0\n").unwrap();
+    let too_low = load_from_path(&path).unwrap();
+    assert_eq!(
+        too_low.window.text_letter_spacing_px,
+        DEFAULT_TEXT_LETTER_SPACING_PX
+    );
+
+    std::fs::write(&path, "[window]\ntext_letter_spacing_px = 10.0\n").unwrap();
+    let too_high = load_from_path(&path).unwrap();
+    assert_eq!(
+        too_high.window.text_letter_spacing_px,
+        DEFAULT_TEXT_LETTER_SPACING_PX
+    );
+
+    std::fs::write(&path, "[window]\ntext_letter_spacing_px = nan\n").unwrap();
+    let non_finite = load_from_path(&path).unwrap();
+    assert_eq!(
+        non_finite.window.text_letter_spacing_px,
+        DEFAULT_TEXT_LETTER_SPACING_PX
+    );
+}
+
+#[test]
+fn resolve_invalid_text_font_weight_resets_to_default() {
+    let dir = fresh_temp_dir();
+    let path = config_path_in(&dir);
+    std::fs::write(&path, "[window]\ntext_font_weight = 123\n").unwrap();
+    let off_grid = load_from_path(&path).unwrap();
+    assert_eq!(off_grid.window.text_font_weight, DEFAULT_TEXT_FONT_WEIGHT);
+
+    std::fs::write(&path, "[window]\ntext_font_weight = 800\n").unwrap();
+    let above_set = load_from_path(&path).unwrap();
+    assert_eq!(above_set.window.text_font_weight, DEFAULT_TEXT_FONT_WEIGHT);
+}
+
+#[test]
+fn resolve_text_typography_in_bounds_preserved() {
+    let dir = fresh_temp_dir();
+    let path = config_path_in(&dir);
+    std::fs::write(
+        &path,
+        "[window]\ntext_line_height = 1.8\ntext_letter_spacing_px = 0.4\ntext_font_weight = 700\n",
+    )
+    .unwrap();
+    let config = load_from_path(&path).unwrap();
+    assert_eq!(config.window.text_line_height, 1.8);
+    assert_eq!(config.window.text_letter_spacing_px, 0.4);
+    assert_eq!(config.window.text_font_weight, 700);
+}
+
 #[test]
 fn resolve_max_images_in_bounds_preserved() {
     let dir = fresh_temp_dir();